1 FEESH-WATER ALGS. FEOM BURM4.
178. PEDIASTEUM DUPLEX Meyen.
P . pertusum Kiitz. Phyc. germ. 1843, p, 143 (in part).
P . Napoliensis Ealfs, Brit. Deam,, 1848, p. 184, t. 31, f. 7.
Var. RETICULATUM Lagerb. Stockholms. PetUastr., etc., 1882, p. 56, t, 2, f. 1.
Yai.—In the Kan-gyi at Mudon (No. 24505).
Family: PEOTOCOCOACE^ (or AUTOSPOEAOE^).
Genus: Ccelastriim Niig.
179, CcELASTRUit CA^[BRICuit Ai'ch. in Quart. Journ. Micr. Sei. 1868, p. 65.
C. pulchnm ScbmicUe in Berichte Deutsch. Bot. Gesellsch, X, 1892, p. 206,
t. 11, f. 1; Boiilin, Alg. erst. Regnell. Exped. I, Protococc., 1897, p. 35,
t . 2, f. 4-10.
Ig, near Hsipaw (No. 24193).
BurkHHa : gen. nov.
Cellula; laxe aggregate ccDnobium subglobosura formantes; cellulis 8 - 1 6 - ? io
ccenobio unoquoque associatis, globosis vel subglobosis (rare ovoidcis) ; membrana
cellulfe uniuscujusque valde et unilateralitcr iucrassata, cornu conicum acutum
leTiter curvatuui foroiante, cornibus cellularum omnium exti-orsum directis;
chromatophoris . . . . ? Propagatio fit gonidiis spluericis imuiobilibus 8-32 quaj intra
cellulam matticalem oriuntur.
180. BUKKILLIA CORNDTA, sp. unica. (PI. xii, figs. 19-21),
Character idem ac generis.
Diam. cell. 13-18/^; long. corn. 7 - 1 7 / i ; diam. ccenob. 7o-88^; diam. gonid.
2-7-4^.
iiai.—Mansang, near Hsipaw (No. 24193).
Tlie cells of tliis genus are loosely arranged to form a cconobiuni of more or less spherical
shape, and each individual cell is furnished -witk a stout,, conical hom, -wMoli arises from a broad
base almost equal to the diametei- of tlie cell. The horn is sohd, and generally exhibits a striation
indicative of the layers of -which it is constructed. It gradually arises by a thickening of that
iurface of the ceU-wall directed to the outside of the colony.
Eeproduction takes place by the formation of 8-32 small gonidia within the mother-cell,
These are set free by the gradual dissolution of the mother-cQll-wnll, wliieh becomes gelatinous. At
this time the whole colony rapidly dissociates. The gonidia are non-motile, hut their development
was not observed.
A few instances were observed of what appeared to be a process of reproduction by budding
from tlie original motlier-cell, but nothing definite could be ascertained from the preserveil examples.
One of these cells is figured on PI. sii, fig. 21.
The nearest genus to BwkUUa is perhaps Scbmi die's Laulerhorniolla (Schmidle, Beitr. Kenntniss
Planktonalg, 1900, p. 149, t. 6, f. 2, 3), m which the ccanobium oonsists of four lunate ce,lls, each
cell possessing two horn»Uke spines.
Genus: Scenedesmus
181. SCENEDESMUS BIJUGATUS. (Turp.) Kütz.
Ac/mani/ies bijuga Turp.
S. quadricauia (Turp.) Br6b. yar. eoornis (Ehrenb.) Ralfs.
Hob.—Moniauk, easfc of Bhamo (No. 21551). Betweon Thingan-nyi-naung and
Kawkareik, in the side-channel of a stream (No. 24483).
182. SCENEDESMUS OBLIQDUS. (Turp.) Kiitz.
Aehnantkes obliqua Turp.
S. aculm Meyen.
Mab.—In springs oa the rlrer bank, Bhamo (No. 21501). In the mountaius east
of Kawkareik (No. 24450).
183. ScENEDESMDS INGRASSA TU LÜG. Bohltn, Alg. erst. Regneil. Exped. i, Protococc.,
1897, p. 24, t. 1, f. 4Ó-Ó1.
Long. cell. 24-27^; lat. cell. (PI. xii, fig. 26).
Jlal.—ln springs on the rirer bank, Bhamo (No. 21501).
184. SCENEDESMUS ACUTIFORMIS. Schröder, Alg. Versuchsteiclio- Schles. Fischereiw.
Trachenberg. 1897, p. 17, t. 1, f. 4.
Var. BRASILIENSIS (Bohlin) W. & G. S. West, Freshw. Alg. Ork. ShetI;
1905, p. 30.
S. Brasiiienm Bohlin, Alg. erst. Regnell. Esped, i, Protococc. 1897;
p. 22, t. 1, f. 26, 27.
S. acutiformis Schröder var. spiniiUferum W. & G. S. West, Freshw. Chlor.
Kob Chang, 1901, p. 98, t. 4, f. 46-49.
Long. cell, sine spin. 13;^; lat. cell. 3-8/;i.
Hab.—In swamp, Eatha (No. 22677). Betwp.en ihingan-oyi-naung and Kawkareik,
in the sido-channeì of a stream (No. 24483).
Stockholms. Pediasfcr., etc., 1882, p. 61,
Lardesdurcbf. Böhm, TI,
185. SCENBDESMRS DENTICOLATUS
t. 2, f. 13-16.
Var. LINEARIS Hansg. in Archiv. Natui-wiss.
1888, No. 6, p. 268.
Hab.—Momauk, east of Bhamo (No. 21551). Mansang near
Between Thingan-nyi-uauog and Kawkareik,
(No. 24483).
186. SCENEDESMUS QUADPJCADDA (Turp.) Bréb.
Achnanihes quadricauda Turp., 1828.
Scenedesmus caudatus Corda, 1838.
Eab.—h\ the Kan-gyi at Mudon (No- 24505).
' (No. 24193).
tlie side-channel of a stream
Falaise, 1835, p.