2 2 4 FEESH-WATEK ALGIE FROM BURMA.
L o n g , sine proe. 36/^, c u m proc. 4 4 ^ ; lat. sine pvoc. 26^, cum proc.
l a t . i s t h m . l l ' o ^.
Uab.—Ums&ng, near H s i p a w (No. 24193).
1 6 3 . SXAURASTRUM LEPTACANTHUM Norclst. D e s m . B r a s i l . 1869, p. 229, t, 4, f. 46.
L o n g , s i n e proc. 34^, cum proc. 8 6 / i ; lat. sine proc. cum proc. 82>i;
l a t . i s t h m . H'O/x.
Jlab.—In the K a n - g y i at M u d o n (No. 2 4 5 0 5 ) ; a b u n d a n t.
1 6 4 . STAUKASTKUM SEXANGOLARE ( B u l u . ) R a b e n h . K r y p t . F]. S a c h s . 1 8 6 3 , p. 621 ;
L u n d . P e s a i . Suec. 1871, p. 71, t. 4, f. 9.
Didtjmoeladon sexangularis Buln. iii H e d w i g i a , 1861, p. 51, t. 9A, i. 1.
V a r . BIDENTATUJI GDTW. Alg. i n s . J a v a , 1902, p. 606, t. 40, f . 63-
F o m i a cum d e n ' r i c u l i s p r o p e b a s i n p r o c e s s u u m n o n b i d e n t a t i s ; e t i a m c u m v e n i i c xs
e m a r g i n a t i s ad apicem i n t e r processus distincfcis. C h a r a c l e r i b u s ceteris ut a c].
G u t w i n s k i d e s c r i p t i s.
L o n g , sine p r o e . 44/i, c u m proc. 8 6 - 9 2 ; u ; l a t . s i n e proc. c i r c i t e r 42/x, cum proc.
1 0 4 - 1 0 7 , . ; l a t . i s t h m . le^^ ( P L x v i , fig. 16).
i / u i . — M a n s a n g , n e a r H s i p a w (No. 2 4 1 9 3 ).
The specimens examined from Burma possessed all the main features of Gutwinski's variety,
suob as the large size of the cells, the loDger processes, aud the more upwardly diverging superior
whorl of processes, but thoy curiously did not possess the character from which he named his variety.
The dentioulations near the bases of the process were in no instances bidentate. Another rather
curious fact is the presence in the Burmese specimens of the emarginate warts on the apices of the
higranulate warts are a
yfaereas Gut win ski
. the
and between the bases of the processes. These
f e a t u r e of typical St. sexangtdare and also of all the varieties
expressly states t h a t they were absent from the
have examined,
he examined from Java,
G e n u s : Onychonema Wallicb.
1 6 5 . ONYCHONEMA LÌEVE N o r d s t . D e s m , Brasil, 1869, p. 206, t. 3, f, 34,
L o n g . 1 6 - 1 7 / i ; lat. sine s p i n . 2 1 - 2 ó i t . , c u m spin. 3 1 - 3 6 ' 5 / I : l a t . isthm, 6/i. (PI.
^ i i , fig. 8).
JJah.—Mansang, near H s i p a w (No. 24193).
Numerous spores were observed of a large form of this species (long. 21-23,4; lat. aine spin.
28-30, cum spin. 41-44,.; diam. spor. cum spin. 23-26;a), but wo arc uneertaiu whether they should
be regarded as zygospores or aplanospores. They were very similar to zygospores of this species
which we have examined from the United States {vide "W. & Q. S. West, gome N. Amer. Desm.
1896, p, 232, t, 12, f, 16, 17), but possessed fewer spines. Never more than two semicells were
observed attached to one of these spores, and always at opposite sides of the spore. In size the
spores were relatively small, and they have the appearance of having been formed from the contents
of one cell only {vide PI. su, figs. 9. 10).
1G6. OKYCnONEMA COMPACTDM Sp. U. (PI. xii, figS. 6, 7).
0 . m a g n u m , filis c o m p a c t i s non t o r t i s ; cellulaì I J - p l o l a t i o r e s q u a m longas,
p r o f u n d i s s i m e coustricta3, sinu p e r a u g u s t o - l i n e a r i ad c x t r e m u m l e v i t e r a m p l i a to
I1YAL0THECA. 22&
s e m i c e l i u l a j t r a n s v e r s e o b l o n g o - t r a p e z i f o r m e s , l a t e r i b u s c o n v o x i s s u r s u m c o n v e r g o n t i b u s,
a n g u l i s i n f e r i o r i b u s r o f c u n d a t i s , a n g u l i s s u p o i i o r i b u s p r o c e s s u s b r e v e s crassos 2 o b l i q ue
d i s p o s i t o s f e r e n t i b u s , a p i c e l a t i s s i m o et r e c t o , cum s e r i e b u s d u o b u s p u n c t o r u m (saipe
i n d i s t i n c t i s ) t r a n s s e m i c e l l u l s m u n a m q u e m q u e ; a v e r t i c e visa3 a n g u s t e e l l i p t i c a ; , r a t i o ne
a x i u m circifcer 1 X 2 ' 5 ; a l a t e r e visas s u b c i r c u l a r e s.
L o n g , 20-23/I. ; lat, 2 7 - 2 9 , . ; l a t . i s t h m . 6 - 7 , . ; <
í í a S . — M a n s a n g , n e a r H s i p a w (No. 2 4 1 9 3 ).
ss. 12,i ; l o n g , p r o c . a p i c . 2 - 8 - 3 - 2 , i.
This plant was very abundant from the above-mentionod locality, occurring in long filaments
which showed no signs of twisting. The cells are of a very charaoterisiic shape, aud no other species
of the genus possesses such a narrow, closed sinus. The apical connecting-pro cesses, by reason of
thc-ir shortness and stoutness, are also unlike those of any otl'.er spccsfs, although they are slightly
suboapitale at the extremity.
The two transverse series of punctulations across the front of the semicells, which are disposed
r a t h e r nearer the apes than the base, are sometimes difficult to detect, but they are probably present
in all specimens if carefully searched for.
G e n u s ; Hyalotheca Kütz.
1 6 7 . HYALOTHECA DISSILIEKS ( S m . ) B r é b . in R a l f s ' B r i t . D e s m . 1848, p. 51, t. 1,
f . 1.
A p l a n o s p o r aD globosEe et g l a b r f c , i n t r a c e l l u l a s s i n g u l a s f o r m a t 9 3.
L o n g . 1 6 - 1 7 , : . ; lat. 2 6 - 5 - 3 0 ^ ; d i a m . a p l a n o s p . 2 3 - 2 5 / . ; (PI. xir, figs. 1 1 - 1 5 ).
I l a h . — I n s p r i n g s on t h e r i v e r b a n k , B h a m o (No. 2 1 5 0 1 .)
B o t h the ' f o r m a bideniula' and ' forma tridoiivla' occurred in abundance, and the plants were
o£ great interest owing to the formation of aplanospores within the individual cells. Aplanospores
have been observed in Hyalotheca neglecta Racib. (vide \V. & Q. S, West, Obs, on Conj. 1898,
p, 54, t. 4, f. 23-27), in wbich species the dissociation of the filaments does not take placo
u n t i l the spore-formation is almost completed, and the mothcr-cells do not change their shape or
increase in size. In the specimens of I I . dissilieiis observed from Burma, dissociation of the
filaments had taken place bsforo the aplanospore-formation, exactly as it does previous to conjuga^
t i o n and the formation of zygospores. Sliortly after tho cells become free they begin to increase
i n volume by a growth in length, ultimately becoming ss long as broad. The chloroplasts soon
show signs of disintegration, and thea the entire protoplasmic mass assumes a spherical shape,
becomes investeil with a thick cell-wall, and forms a globular aplanospore. The increase in the
l e n g t h of the cell is often uneqiwl, resulting in an asymmetrical mother-eel].
1 6 8 . HYALOTHECA BURHENSIS sp. n. ( P I . xii, figs. 1 - 4 ).
H . m e d i o c r e , filis non t o r t i s , sino v a g i n a m u c o s a ; eellulaj pauDo l a t i o r e s q u am
l o n g i e , s u b q u a d r a t a s , nou constrictas, l a t e r i b u s s u b a n g u l a r i t e r c o n v e x i s , a p i c i b u s late
t r u n c a t i s r e c t i s q u e ; a v e r t i c e visfc c i r c u l a r e s . Z y g o s p o r e late o b l o n g o - e l l i p t i c s e,
m a r g i u i b u s i r r e g u l a r i t c r u n d u l a t i s vel n o d u l o s i s p r a j c i p u e polos v e r s u s.
L o n g . 1 8 - 2 0 lat. med. cell. 22/.; lat. apic. 1 9 - 3 0 / . ; long,
l a t . z y g o s p . 2 2 - 2 3 / ..
Ilah.—Mansang, near H s i p a w (No. ¡34193).
ANN, EOV. BOT. GAUD. CALCUTTA YOL. V I.