Helminthocladia yendoana S.Narita

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236
Helminthocladia Yendoana Narita Bull. Fan Mem,
Inst. Biol. 7: 236, fig. 2. Mr. 1937
BULL. 'FAN* MEM. INST. BIOL.	Vol. VII.
26. Helminthocladia Yendoana Narita
(Fig. 2)
I.e., p. 191, pi. 4, fig. 2, 3; Yamada, Mar. Alg. Mutsu Bay II (1928) p. 517;
Okamura, Short Notes on Jap. Mar. Alg. (1934) p. 885.
H. australis (non Harvey) Okamura, Icon. Jap. Alg. vol. 2, no. 2 (1916) p,
21, pi. 156 (p.p.).
This species has long been suspected to be nothing but a
northern form of the foregoing species. It is only lately regarded as
valid by Okamura (1934) who shows that these two species differ
decidedly in several important respects and concludes that "H.
Yendoana Nar. is a well established species differing from H.
australis Harv.?? On our coast, there is, besides the above mentioned
Australian species, another Helminthocladia that is referable to
Narita?s plant. The chief difference between these two species on
which I like to lay special emphasis lies in the form and size of the
assimilatory cells. While H. australis Harv. has barrel-shaped,
markedly moniliform assimilatory cells which usually attain a breadth
of 20n or more in the swollen middle portion, the present species has
these cylindrical, sometimes constricted, but never so much noticeably
laterally swollen as those of the above species and rarely attaining a
diameter more than 14^- In the former species, the terminal cells of
the assimilatory filaments are shorter, usually only a little longer than
broad, and sometimes two or three diameters long. In the latter one,
however, these are much more elongated, usually more than two,
sometimes to 5 diameters long (cf. figs. ia and 2b). The central
filaments of this species are also smaller, generally about 14-20/* in
diam. Externally, the present species may also be easily distinguished
from the above one by its much slenderer minor branches. The
distribution of these two species seems to differ too. H. australis
Harv. seems to be an inhabitant of the warmer waters while the
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C. K. TSENG: ON MARINE ALGAE NEW TO CHINA II
237
HERBARIUM OF THE UNIVERSITY OF AMOY
CHINESE MARINE ALGAE
H®la?Hthocl?icl?H Tenfloaua Sarita ^
Loc. Tung Shan Isl. 3ft ill Sj
Collector Tseng, C. K.
Determined by C ® K ? 5? K (I ii **
No. 1376
i? 3 01935
present species grows in the relatively colder waters. Thus, on our
coast, the former is found only on the southern coast of the South
China Sea (Hainan) whereas the latter is found on the eastern China
coast (Tungshan and Tsingtao), so far as my present collection
shows,
This plant is also dioecious as in the above one, thus differing
fundamentally from H. purpurea (Harv.) J. Ag. with which H.
australis had long be suspected to be identical. The plant from
Tungshan I., collected in May is antheridial. It attains a height of
15 cm., attaching by a small disc. The main stem, about 4 mm.
diam., is simple or forked, giving rise to lateral branches which are
irregularly branched. The branches of all order, like those of the
238
BULL. FAN MEM. INST. BIOL.
Vol. VII.
above species, do not attenuate at the base but distinctly do so
upwards. Branches are even more irregular than those of the above
one but are not so widely patent. The antheridia form hemispherical
clusters at the ends of the assimilative filaments (cf. fig, 2, c). The
plant collected from Tsingtao in October is carpogonial. It is dwarf
and small, probably not accustomed to grow in the relatively colder
water of this region at that period. It attains only a height of 7-8
cm. and a diameter of 1.6 mm. for the main axis. The difference in
diameter between the minor branches and the main stem is even much
greater. The procarp, as in the above species, consists of three cells,
the uppermost one prolonging into a long slender trichogyne (cf. fig.
2, a). The plant is very soft and gelatinous in substance. It is
reddish purple in the living state, fading to a brownish purple color
when dried.
HAB. On reeks, in the lower litoral belt, Tungshan I., in May
(Tseng 1376)', on small stones, in shallow rock pools in the lower
litoral belt, Yen-er-tao, Tsingtao, in October (Tseng 2166).
DISTR. Japan.
Fig. 2.
Helminthocladia Yendoana Nar. X 200.
(a)	Assimilating filaments and a carpogonial
branch (from Tsingtao).
(b)	Assimilating filaments (From Tsingtao).
(c)	Assimilating filaments and antheridial
branches (from Tungshan 1.).
NEW YORK BOTANICAL GARDEN
02213828
CHINESE MARINE ALGAE
HERB. NATIONAL SHANTUNG UNIVERSITY
EW
YORK