I

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IB

(CONES OF JAPANESE ALG/E

Vol. II

PL. L-C

BY

K. OKAMURA

RIGAKUHAKUSHI

MAY 1901-NOVEMBER 1912

TOKYO Published

by

THE AUTHOR 1912

CONTENTS OF VOL II.

(ARRANGED IN THE ALPHABETICAL ORDER OF GENERA).

Aivtabularia Calyeulus Q. et G. li £ K_ A1 3

Acctabuluria caraibica Kuetz. O © A^ 3 CD b

A ce tabular ia niinutissiina Okam. n. sp, .6^ ^ #* 3 0 I)

Botryocarpa japonica Okam. n. sp. "f~ V L -6 0 1)

Callymenia cribrosa Harv. O ft* 3 $) &

Campylaepliora Hypnaeoides J. Ag, ^ C" (7) f>

Carpopeltis angusta (Harv.) Okam. ^ A/ i S

Carpopeltis articulata Okam. ^ L ^ A/ i &

Carpopeltis elata Okam. ft* |t A/ £ Is

Carpopeltis rigida (Harv.) Schmitz. t> ^ f J? & A> £ ^

Ceratodictyon spongiosum Zanard. ft* (,•• fe A/ 3 5

Chretomorplia spiralis Okam. ^, i t>* <fy -p ^

Champia parvula (Ag.) J. Ag. ifo <5 |f 3 5

Chondria intricata Okam. n. sp. ^ O i}l KD ^C

Chordaria abietiua Rupr. &. "O &

Chordaria flagelliforiuis (Muell.) Ag. fj; ^>> ^ o fe

Cladophora rugulosa Martens. < -6 L (i C 3

Cladosiphon decipiens (Suring.) Okam. ^ o* (

Coustantinca Rosa-marina (Gmeliu) P.

etR. & $ ^ C,

Cryptoneniia Schmitziana Okam. fc |J |i* ^ A/ i I1

Dasyopsis plumosa (Bail, et Harv.)

Schniitz. 1z U/ & i' |f

Dasyphila Tagoi Okam. n. sp. fj C* <£> !)

Delesseria fimbriata De la Pylaie. i>' L fc It ; ?> II £> 1J

Delesseria Middendorfii Rupr. ^fi?Z. <Z) ii 2) !)

Desmarcstia latifrons (Rupr.) Kuetz. (i 5 ^> L C 3

^a ligulata (Lightf.) lyauiour. 5 4 L C 3

PLATES. C.

XCIX. C.

LXXXI-LXXXII.

LXXXVI-LXXXVII.

LXXIX.

LXVU.

LXVIII.

LXIX.

LXVI.

LI-LI F.

XCV.

LXXVI.

XCIX.

LXXXV.

XC.

LXXX.

LXXXIX.

LXXVII-LXXVIII. LXXI.

LXXVIII.

Lxxxvnr.

LXXXIII.

Lxxxrv- LXXXV.

LXXIV-LXXV. LXXII, LXXV.

T A,

©

fl

Desuiarestia viridis (Muel.) Lamonr. frt 9 £ L C

Eucheuma spiaosum (L.) J. Ag. & b A, 3

Gelidium pusillum (Stack.) L. Jol. fj li"1 "C A> C

Gelidiopsis rigidum (Vahl) Weber v. Bosse. (#(/>'•• Gelidium rigidum

(Vahl) G'rev.). L

Gloiopeltis cervicornis (Sur.)Schmitz. Ji

Halymeuia formosa Harv. O

Herpopteros Zonaricola Okam. n. sp. L

Hyalo.siphonia crespitosa Okam. n. g.

et. sp. I'*

Hypnea musciformis (Wulfeii) La-

niour. ft* ;

Hypnea Saidaua Holmes. 3

Hypnea variabilis Okain. n. sp. It

Laurencia conciuna Mont. £

Laurencia dendroidea J. Ag. ^

Levcillea jungermannioides (Mart, et

Hering.) Harv. b

Marteusia denticulata Harv. 3) *

Marteusia elegaus Heriug. So

Microdictyon pseudohaptcron A . ct. E.

S. Gepp.

OJonthalia corymbifera (Gmel.) J. Ag. Ill}

Pey.s.ionuelia iuvolveus Zanard. ( 'j

Polyopes Polyidouides Okam. J;

Prionitis patens Okam. £/

Pterosiphonia fibrillo?a Okam. n. sp. \)

Symphyocladia gracilis (Harv.) Fal-

kenb. ^ '

Symphyocladia linearis (Okam.) Fal-

keub. fi

Symphyocladia marchautioides (Harv.)

Falkenb. w

Ulva reticulata Forsk. fo

Valouia coufervoides Harv.

LXXIII, LXXV.

LXI-LXII.

LIV.

LIX.

XCIV.

LXII.

LV.

LXIV-LXV.

' ^ if e, © b

LIX-LX.

^ /:' ^ if c,

LVII.

^ ^ (f ?,

LVI.

v © ti K

LX.

& \> %

LVTII.

r3 If l> <D b

XCII.

5(: L ^ I1!'

LIU, fig. 4.

^ U L S

LIII-LIV.

© fe <' 3

LXXX.

§ -% o : -y «) c/ it

XCI.

•:^ to o*1 to

LVII.

fs fi' 5

LXin.

& 1 Ay i 1

LXX.

li *3 (* 3

XCVIII.

fr tr 6 * &

XCVII.

?: i 5* *3 &

XCVI.

3* 43 fe

XCIII.

^ * & 3

c.

fc (f b \~- Sr>

LXV.

S55 + - SK5.

PLLI.

K.Okam. del.

4- 5

"

Ceratodictyon spongiosum. Zanard.

PL.LII.

91 6 10 -U

Ceratodictyon spongiosum. Zanard. ^^"

Ceratodictyon spongiosum Zanard.

Norn. Jap. : Kaimen-so. PL LI-LII,

Ceratodictyon spongiosum Zanard. Phyceac Papitanac n. 8 ; Eng- ler-Prantl Nat. Pflanzenfam. I, 2. p. 388 ; De Toni Syll. Alg. IV, p. 409. Sporgia cartilaginca Espcr fider Semper Nat. Exist, d. Thicre II, p. 777- /<?/.— Marckesettia spongioides Hauck ; Asken. Alg. Forschungsr. Gazelle p. 40, t. XII, f. i-n.

Hab. : Widely stretched on rocks between tide-marks. Provs. Kagoshima, Hiuga, Tosa, Kii (C. Shiwo-no-misaki). Plants are variegated with dark bluish purple and greenish colour.

PL. LI. Fig. 1-2 : fronds of Ceratodictyon spongiosum Zanard. bearing antheridial ramuli, in nat. state and size. Fig. 3 : portion of frond in nat. size, showing the surface of frond, fertile ramuli, and osculi. Fig. 4- : portion of the cross-section of frond showing the sponge and net-work-like structure of frond, 4£. Fig. 5 : sarcode, s, of the sponge and spicules, ^f5.

PL. LII. Fig 1 : growing apex of the frond, - j—. Fig. 2 : cross- section of a ramulus, -f. Fig. 3: portion of the cross-section of a ramulus, -3^Q. Fig. 4 : portion of the longitudinal section of a ramulus, ^-Q. Fig. 5 : terminal portion of a sterile ramulus standing free from the net-work, ^. Fig. 6 : upper portion of frond bearing antheridial ramuli, J^. Fig. 7 : portion of the longitudinal section of a ramulus bearing an antheridial patch, -2-p. Fig. 8 : longitudinal

PL. LI-LV, May, 1909.

section of the upper portion of frond showing a fertile ramulus bearing cystocarps and net-like structure, \2. Fig. 9 : longitudinal section of cystocarp, ?.*. Fig. 10 : portion of the neucleus with a part of the central cell, 3^-. Fig. 11 : very young neucleus ; two larger cells below the cell, c, just going to fuse to form the central cell, ^.

Ceratodictyon Zanardini 1878. i1 f J& A, 3 '•) J&.

CERATODICTYON (SPHAEROCOCCACEAE). fz i fr ft, i1 ft bu ^ j 35 ft.

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Ceratodictyon spongiosum Zanard.

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£ / III $5 h Askenasy ft

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tft ^ /?£ - ? jg ^ ff ft -y ^

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Semper, von Hauck, Marchesetti - -> ^ , jjfc fa Ufa ^ ft ^ & f$

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V - », 391°--4 = M / « Hi ffi / - SIS, ^°.

$ ^ Si- 'V--3 : HO

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PLLIII.

S 26113

Martensia elegans Hering. & *? 3 L I .

PLLIV.

K.Okam. del.

8 12 9 Z 11 1

1O 4 S 13 7

Martensia eleg'ans Hering. ife -"P 3 L % Fig1. 1-9 . Gelidium pusillum (Staokh.) LeJol. te£A<A/<^ Fig1. 10-14.

.

•*, -V-—9 : $ * ' m Bfi IS. V--10 : '!' *& *ffl US ^ - «J

'jr&S -- ^J ? >T< ^ . 301°.— 11 = t- ' fi ^ ^ #J * E 121 =•

flti ^ T - K ^ ffl ^c t ^ 11 S3 US •" 51? ? - Tfe ^ -^

1

Martensia elegans

Nom. Jap, : Aya-nisliiki.

PL. LIII ; PL. LIV, Fig. 1-9.

Martensia elegans Hering in Ann. of Nat. Hist. Vol. VIII, p.

92, Oct. 1841; Harv. Ner. Austr. p. 73, tab. 43 ; Kuctz. Sp. Atg-.

p. 988; De Toni Syll. Alg'. IV, p. 616; Svedelius Martensia, 1908,

. f. 31. Martensia anstralis (non Harv.) Okam. |5^ ffi, H-fc?*i$li&3E

p. 48 and 232.

Hub. : On the fronds of other algae or among corallines near low tide. Prov. Hyuga, Amakusa Isl., Hirado (Prov. Hizen). Prov. Shima, Prov. lyo, Isl. Kodzu and Oshima (Prov. Iclzu), Provs. Sagami and Boshyu, Mito (Prov. Hitachi), Prov. Tango.

A', -marks : Of the form of frond as well as of the development of the net-work, I think, there will be no need for further remarks, as Svedelius amongst others fully described it of late. Among the materials passed through my hands there are two extreme forms.

6

One has very much elongated, linear, band-shaped frond and it branches in an irregularly dichotomous manner, having the net-work on apical portions of branches whose continuous (not net-worked) portion and the upper margin of the net-work are serrated (PI. LIII, fio-. 3). The other one develops secondary net-works on the lobes of primary marginal membrane which grow up into cuneate segments (Id., fig. 4.)

I took the linear form referred to for an extremely abnormal form of some species of ftfarteiisia and the alternately net-worked one for either J\I. denticulata or M. pctvonia. Recently, N. Svedelius made a full study on the plants of this genus, and in his work, it is stated that HI. denticulata has the aforesaid continuous portion developed in the highest degree of all species, and from that character I think both forms in question to be J/. denticulata. But, at present, as the materials are only fragmental, I leave the matter for my further stud)'.

PL. LIII. Fig. 1 : frond of Martcnsia elcgans Hering in nat. size. Fig. 2 : older frond with lacerated net-work, nat. size. Fig. 3 : portion of a linear, elongated frond considered to be an abnormal form of M. denticulata, \ . Fig. 4 : portion of the alternately net- worked frond of J\l. denticulata (?), bearing tetrasporangia in the primary membrane, \. Fig. 5 : portion of the net-work ol R[. cL'^ans bearing cystocarps, -\-. Fig. 6 : cystocarp, ^f. Fig. 7: longitudinal section of cystocarp, **.

PL. LIV, fig. 1-9. Fig. 1-2 : growing marginal portion oi frond of Jlf. elcgans showing the development of the net-work in surface view, 2i°. Fig. 3 : the same further advanced with some cross-bars pro- duced from the longitudinal bars (i.e. lamellae of Svedelius) 11U\— Fig. 4: cross-section of the membranous portion ( I oo /* thick), -;".— Fig. 5 a-c : three portions of the longitudinal section of the net-work

7

bearing tetraspores, extending from the upper margin to a longitu- dinal bar ; the former shown in section, the latter mostly in surface- view of the side ; a, bottom surface of a gap in the plane of the section ; the ends marked x and x 1 in one portion are connected with those bearing the same marks in the other, but with the intervening portions omitted, *-*— ; portion marked 5 b measures 32 p in thick- ness.— Fig. 6 : portion of the surface-view of the net-work bearing tetraspores, s*. Fig. 7 : portion of the same as tig. 6 magd., ^ . Fig. 8-' cross-section of the net-work bearing tetraspores, 91-. Fig. 9 : surface-view of the side of a longitudinal bar showing the cells covering a tetrasporangium, ^.

Martensia Hering 1841. to * \- L £ A-

NITOPHYLLEAE (DELESSERIACEAE).

c 0 H 0 b ft, 5 t tf 0 b 35 ft. «S - H JUc =• * ? ?f:^ , 5UJc X - M * - # IS -y, *%]%-* -

mm+ *, m * ? fig ' & m - \s * ?&$'&?&* %-s^n

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jst v , ts - ft ^ -t fig / m M ^ it w ? t s'fi^,si/ts^a =

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m v 7 m E & / ji «u / ^ is - - £u g * r# ^ IK ^ ? t ^ , at if?

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s

;fc y, B.IE J? M ;1X SB / T $

'" (Ff = ^ y

-T

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IE V ^ ->'- ^ ft = 1^ ,ty v

$ Jft > R ft * £ P. ft 7 H r 9 M /

Prof. Martens R^^-ff/^^sgy^^^- y.

Brussels

Martensia elegans Hering 1841. b * C L I IH3 # Sf.

|g LIII P| jjg ; ^ L1V H (S, 1-9 I.

, fit ' T

10-15 cm. - i^ -y,

Ma 9 $ 9 , 1-2 If 75 cm. - * fs

? ^ ffi

£1 •?• IS , ffi -y 7

ft Ifp >^ ^ ft =. -y r , l *gtf'fr ^ I? - Pfl

7 ^ ^ -t h (^ ** p] ^

y i v -*, ^ ft if^ ,f.

JHH ft » - ^ f 3-

r y (^ LIII 0 )K, 2 1). 15/«. ^ * tt /* JHO US ffl

i- & %> m m ^ ^ ss

S -

. 2 1). Jft «£ ?ij / JJH9 .IE - IE =• §1 /

II * a* in * $} *,

LIV pi )&, i I

iu 7 ^ «9 -y , m * *ra na - & * $ -

^7- Bfl PI 7 ?B B5: S ft -y 7 ^ SJ s/,

v^

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7

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S

#*

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IK *

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fa /

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^* I' ; 4" ^ tt ^ ?K •* J5f - fll ;l/ =• RI- denticulata

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T& is ^ A- ^

v/ b ,S 'Itl

fg LIII d] Jjg. 1 : Martensia elegans Hering, %)*$>{'. L % , S %& ft ? $S y ^ A ^e / , i- 2 : $J JUc nft ' fiS'"' * S ? ^ A ^ / , i ;. 3 : iM. denticulata / @ If; b ,©, ^ A -T= / , }-.— 4 : _h $|c / )K- >T" S )S fi •>

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ei iff M. if *• ioo «, as.Q.-5 ^ : m & m ? ? w ^ * ffi ' m s& * y m

JR SB - ^ * f m * * " Tiil - / if iS ^ H 119 - # ^ T- -n -> * r

01 i- ^ V * £- ^ SIJ ^

ifii t I ; 5 * ' * -W * 33 7 J ; >-4-J.-6 :

9 :

Gelidium pusillum (Stackh.) Le Jol.

Norn, Jap. Hai-tengusa. PL. LIV, Fig. 10-14.

Gclidinm pusillum (Stackh.) Le Jol. List. Alg. Mar. Cherb. p. 139; Hauck Meeresalg. p. 195; Okam. List Mar. Alg. Carol. Isl. and Austr. (Hot. Mag. XVIII, Tokyo, 1904, p. 86-87); De Toni Syll. Alg. I\r, p. 147. Fucus pusillus Stackh.; Turn. Mist. Fuci. t. 108. Gelidium contemn var. clavatum Harv. Phyc. Brit. t. 53, f. 6. Gclidinm contemn var. cacspitnsnin }. Ag. Sp. Alg. II, p. 740; Ardiss. Ph)-c. Med. I, p. 288. Acrocarpus pusillus Kuetz. Sp. Alg. p. 762 ; Id. Tab. Phyc. XYIII, t. 37. Acrocarpns pulrinatns Kuetz. Sp. Alg. p. 762 ; Id. Tab. Phyc. XVIII, t. 37. Gclidinm puk'inalnm Tluir. in Born. Alg. Schousb. p. 768. Gelidium repens Okam. Contr. Knowl. Jap. Alg. Ill, p. 7, Pi. I, f". 5-8 (Bot. Mag. Tokyo, Vol. XIII, no. 143, p. 8); Id. Alg. Jap. Exsic. n. 5; De Toni Syll. Alg.

IV. p. 1860; [SJ f|, u $ fi m & ae p- 2 1.

Had. : On rocks near high tide. Provs. Ise, Sagami, Boshyu, Kadzusa.

PL. LIV, fig. 10-14. Fig. 10: densely matted patch of Gclidinm pusiilnm (Stackh.) Le Jol. in nat. state and size. Fig. 11 : single frond in the natural state and size. Fig. 12 : portion of a sterile frond viewed from the under-surface ; r, root; moderately

magd. Fig. 13: portion of frond bearing tetrasporangia, 313. Fig. 14: portion of frond bearing cystocarps, ?f.

Gelidium pusillum (Stackh.) Le Jol.

\i o- -c A,

m ft f»-

, ,0-14 m.

_h ->- -t t ^e -?•

IB f$

/ ffi

in

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$) JUc ^ 51 ® ' in 9 i- >" i n r , S ' I* iS ^

H r ') . fe - Iffl ft $ b!c t 300-350 r j ) f-

m *, ^ =- ^& v ? ^^- ^ t y , ^ E 'in * t

0 ^> Jltl ^ - /h «! DH JEJ / in ^ JUc. ifi S4 X - « fi. " J^ H fe-

TV $ -fc 7 ^- H S -t A- /j, ts = ^ j ^

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* *" ^

fr- v 7

t

mi : ig^

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7

PL.LV.

K.Okam. del.

if IS 1 4 16 Z S 10 8 9 6 1 K IS 11 13 19 3

Herpopteros Zonaricola Okam. n. sp. (^ CT) ^> ("£

13

ffi LIV [H Jig. 10-14 p. 10 : Gelidium pusillum (Stackh.) Le Jol., d> T A, <' 3, / m £ * r ft, S ^> * -11: & «3 ' 10 If- @ & '

f-i2: y. •)• * ffi / - sr> 7 a K a ? m ^ ^ * ^ ; >-. ft ^ ^ ;

*.-13 :pg»JKadFg'?^^^flS/ -SB, \3 -14 : m Jfe ^ ^ ^

fit ^ - «, ^.

Herpopteros zonaricola n. sp.

Nonii Japi : Sldnobu-gusa. PL. LV.

Diagn. Fronds filiform, creeping o*h other algae, with dorso-ven- tral structure, alternately branched ; main branches with longer or shorter pinnae which are similarly pinnated with teeth-like pinnulae. Branches arise spirally in -5- divergence, of which one dorsal and two ventral ones remain undeveloped and the remaining two grow up to normal branches subdistichously arising from somewhat dorsal side of frond. All of them either undeveloped or growing carry dichotomo-decompound hair-leaves on their apices. Pericentral cells five in number, of which two are disposed on the dorsal side and three on the ventral, and throughly ecorticated. Tetrasporangia produced in somewhat stichidia-like pinnulae, being arranged in a slightly twisted longitudinal order with a single sporangium in every articulation and provided with a single disordered row of the remains of hair-leaves on the dorsal side, externally covered with two cover-cells on the ventral side. Antheridia pro- duced on hair-leaves on the terminal portion of pinnulae. Cystocarps ovate and sessile.

Hab, : On the frond of Zonaria Dicsingiaita J. Ag. growing

14 between tide marks ; BoshyO. Fruits : late spring to summer.

Description. Fronds filiform, almost terete creeping on other algae by emitting scutate discs from the under-surface, subdistichously branched in pinnate manner. Main branches alternately pinnated with longer or shorter pinnae which often grow up into similarly pinnated branches of indefinite growth or remain short by making definite growth with alternately arranged longer or shorter teeth-like pinnulae. Main branches are often arranged in somewhat corymbose

manner.

Frond has five pericentral cells, throughly ecorticated, of which, two are on the dorsal side and three on the ventral. From every articulation branches are emitted, being spirally inserted in the arrangement of-*- divergence; of thorn, those standing on the dorsal median line and on two longitudinal rows of the ventral side, all of them alternating with five articulations, do not however, develop at all, but remain only one celled. Only those standing along both sides of the frond and somewhat approaching to the dorsal side develop into longer or shoter lateral branches. By latter arrange- ment of the lateral branches dorso-ventral character is weakly represented. All those branches, either growing or rudimental, carry, when young, hair-leaves on apices. Hair-leaves are decom- pound clichotomous and those growing on the branches arising both from the dorsal and ventral surface are of weaker nature than those on the lateral ones.

Tetrasporangia produced in a slightly differenciated stichidia- likc pinnulae which are somewhat fusiform, slightly swelling in the middle portion. They are arranged in a very slightly twisted and almost longitudinal row, each articulation containing one sporangium and provided with a single disordered row of the remains of hair-

15

leaves on the dorsal side, being covered with two cover-cells on the ventral.

Anthericlia formed from hair-leaves grown on the terminal portion of pinnulae. Procarps are formed from the second joint of a hair-leaf growing near the apex of branches. Cystocarps are ovate and sessile. Colour red.

Remarks. A distinct, new species. That dorso-ventral structure of the present plant is not so manifest as that of the type-species, H. fallax Fkbg., is only seen from the arrangement of the normal branches which arise subdistichously from somewhat dorsal side of frond. In the present plant, branches are spirally grown in the arrangement of \- divergence, of which, however, two branches alone develop into the aforesaid normal ones, while the rest remain in a rudimental state. The apical portion of the plant in question does not indicate any distinct dorsoventral nature.

While this nature is more clearly shown in the type-plant in the arrangement of both normal and rudimental branches arising on the dorsal side of frond, in the present plant, it is only weakly indicated as described above. But as we learn from Falkenberg's Rhodo- melaceen p. 52 that the dorso-ventral character is represented in different ways even in the different species of the same genus, we think we are right to put the present plant in this genus.

PL. LV. Fig. 1 : fronds of Hcrpoptcros zonaricola Okam. n. sp. on the frond of Zonaria Diesingiana J. Ag. in nat. state and size. Fig. 2: portion of the frond magd., -"-. Fig. 3-' portion of a branch ; a and b, hair-leaves still remaining on the branches growing from the dorsal side of frond ; 5*. Fig. 4- : apical portion of a branch viewed from side ; a and b, hair-leaves growing on the dorsal side of frond; 3^°, Fig. 5: dorsal view of an apical portion of a

i6

branch ; a, /3, hair-leaves on lateral branches ; a, b, the same on those growing from the dorsal and ventral side respectively ; 3 ®— . Fig. Q : ventral view of an apical portion of branch ; characters same as in Fig. 5 ; ^~. Fig. 7 : cross-section of frond with the dorsal side, a, above, 3-f--. Fig. 8 : diagramatic cross-section of frond with a scutate root, «, /3, and d, and e, e indicate places where the normal, the dorsal and the ventral branches arise respectively. Fig. 9 : dorsal view of a stichidium, '2'~°. Fig. 10: ventral view of the same, showing cover-cells ; the line a b indicates the lower end of the cavity in which tetrasporangia are contained ; 2j-. Fig. 11 : terminal portion of a branch bearing a fully grown antheridium and two young ones seen from the dorsal side of frond, ^p. Fig. 12 : early stage of an antheridium ; a, growing apex of the branch ; 3J°. Fig. 13 : anlhericliutn, 2j°. Fig. 14 : a young procarp, p, ^-°A Fig. 15 : the same bearing a trichogyne, /, -°-. Fig. 16-17 : cystocarps, •'i*. Fig. 18-19 : dorsal view of stichidia, showing the disordered arrangement of basal cells of hair-leaves, 2-p.

Herpopteros Falkenberg.

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Hypnea vanabilis Okam. n. sp. ?£•£•**&"

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Hypnea variabilis Okam. n. sp.

Nom. Jap. : Tachi-ibara. PL. LVI.

Diagn. : Fronds erect, coespitose, not coalesced to each other, with fibrous roots, compressed, often slightly channelled, subterete in slender branches, virgately branched with ramifications between pinnate and dichotomous, elongating upward into slender branches or ending in thicker and bluntish apices, patent, rarely naked, usually furinshed all around branches with non-constricted spinose ramuli which here and there elongate into ordinary ones. Sori formed around the middle and lower portions of ramuli. Cystocarps globular and sessile.

Hab. : Perhaps below the low water-wark. Owashi (Prov. Kii), Shinoshima (Prov. Mikawa), Enoshima and Kamakura (Prov. Sagami), Prov. Boshyii, Prov. Kadzusa, Yotsukura (Prov. Iwaki).

Fruits : summer.

Descrip. : Fronds coespitose, erect, not coalesced to each other, often froming a roundish mass, standing with fibrous roots virgately branched with the ramification between pinnate and dichotomous. In some fronds, main-branches are more pinnate, in others more dichotomous with thicker branches disposed in pinnate manner, and still in others dichotomo-decompound. Thus, the from of irond is very variable in appearence. Branches are patent and not constricted at their origin, rarely naked, usually more or less furnished with teeth- ike spines all around the sides, often in dense aggragations, which

PL. LVI-LX. Aug., 1909.

here and there grow up into longer or shorter branches carrying similar non-constricted spines. In thinner and weaker forms, which perhaps grow in calm places, branches are often very fine and thread- like (Fig. 4). Fronds become a little broader toward the middle por- tion rising from more or less narrowed base and terminate in bluntish apices or branches often elongate into slender ones. Plants attain the height of 4-13 cm. with the breadth of 1.5-3 mrn- 'n wider portions. Fronds are compressed, except the slender branches which are almost cylindrical and broader portions are often slightly channelled.

Sori are formed around the basal or middle swollen portion of spinose ramuli. Cystocarps are globular and sessile, many formed along the sides of ramuli. Substance is rigid cartilaginous and is rather stouter than the majority of our species of the genus.

Remarks : The present species is to be placed in the vicinity of Hypnca spidfcra (Suhr) Harv. under the section Virgatae.

PL. LVI. Fig. 1-4 : different forms of fronds of Hypnea variabilis Okam n. sp. in nat. size. Fig. 5 : frond bearing cystocarps, \. Fig. 6 : growing apex of the frond, 3"°. Fig. 7 : cross-section of the frond, *. Fig. 8: portion of a cross-section of the frond, 514. Fig. 9 : portion ot a longitudinal section of the frond with axial filaments, c, JJ°. Fig. 10 : branch bearing cystocarps, \. Fig. II: vertical longitudinal section of a cystocarp, 514. Fig. 12 : portion of the ncucleus and pericarp, 2~°. Fig. 13-14-: branches bearing tctrnsporic sori, \~. Fig. 15-17: cross-sections of different parts of different branches bearing sori ; Fig. 15-16: ^ ; Fig. 17: \2. Fig. 18 : portion of a sorus, -:J0.

Hypnea variabilis Ok

am.

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Hypnea Saidana Holmes.

Nom. Jap: Saida-ibara. PL LVII, Fig. i-io.

Hypnea SaiJana Holmes New Marine Algae from Japan (Journ. Linn. Soc., But. Vol. XXXI, p. 256, PL XI, f. 3); De Toni, Syll.

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Hypnea saidana Holmes Peyssonzielia involvens Zanard.

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Frond forms a roundish mass with branches intricated and attached at points to each other. Main branches are flexuose, more or less dichotomous with alternate branches which are mostly curved and loaded with short, secund, very patent, thorn-like ramuli. All the branches are compressed and taper to sharp point rising with not- constricted bases. Plant attains the height of 6-10 cm. with the breadth of 1-2 mm. in broader parts. Sori are formed around the mostly basal swollen parts of ramuli. Substance is slightly cartilaginous when fresh,