CHAROPHYTA FROM ANNAM AND GUAM 
By James Groves 
Of Yarmouth, England 
NITELLA ACUMINATA Braun. 
A form with the size and habit of Nitella flexilis, but with 
small, rather dense heads; secondary rays fairly long. It has 
well-developed, usually geminate, ripe fruit; the oospore is 
golden-brown, about 275 g long, 225 g broad, 175 g thick, showing 
about 8 ridges with flanges and a distinct crest; membrane with 
minute granular decoration. 
Indo-China, Annam, Nhatrang and vicinity, C. B. Robinson 
131+2, March 11 to 26, 1911. 
NITELLA DUALIS Nordstedt. 
The female plant with well-developed fruit; the oospore is 
golden-brown, about 180 to 200 g long, 150 to 160 g broad, 100 g 
thick, showing 6 or 7 low ridges ; membrane with netted decora- 
tion, the meshes about 5 g in diameter. The fruiting whorls 
are enveloped in dense mucus. Though the dactyls (= ultimate 
rays) are 2-celled, the allantoid form of the upper cell shows 
the relationship of the plant with the most extreme members of 
Braun’s section Polyarthrodactylae, rather than with the species 
placed by him under Diarthrodactylae. The dactyls with their 
almost mucronate points to the upper cells correspond with 
Nordstedt’s figures of the original plant and, although the oo- 
spore is smaller, its shape and the decoration of the membrane 
agree with the description. Unfortunately, the specimen is not 
a satisfactory one owing principally to having been floated out 
on harsh coarse-fibered paper rendering it well-nigh impossible 
to detach the slender sterile branchlets intact, but the dactyls 
of these as well as those of the fertile branchlets appear to be 
uniformly 2-celled. The original specimens of Nitella dualis 
came from Liberia, West Africa, and so far as I know it had not 
hitherto been found elsewhere, so that Doctor Robinson’s dis- 
covery of it in Annam is of great interest. 
Indo-China, Annam, Nhatrang and vicinity, C. B. Robinson 
1506, March 11 to 26, 1911. 
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