NOTES ON FRESHWATER ALG 87 
pairs of cilia. The zygospores come to rest, and after ete their 
cilia and acquiring a strong “io gma so far as was observed, formed 
resting-spores or hypnospores. None were observed to germinate 
directly. The hypnospores gectainaled after several weeks, dividing 
first into four cells, but afterwards the division was irregular, The 
pyrenoids were most conspicuous in the young plants 
16. Uronema conrrrvicoium Lagerh. in Malpighia, 
t. xii. f. 1-10. Crass. fil, 5-6». (PI. 447, figs. 11-18 
Hab. Esher Common, Surrey. 
This genus of Ulotrichacee has not previously been observed 
from Britain. The filaments are relatively short, and both the 
— and basal cells are attenuated, the latter secreting an adhesive 
e chromatophore is parietal with two pyrenoids, but in 
Es specimens observed it was rather difficult to clearly define. The 
zoogonidia were not observed, although empty cells were seen from 
which they had escaped. 
One instance was observed of the formation of a fe 
1887, p. 518, 
3.) 
spores. Two of these were forme 
provided with strong cell-walls. They appeared to have ; ines from 
zoogonidia which had been arrested in their exit from the cel 
Pseudochete, gen. n. 
Thallus filamentosus, ramosus, e ramis repentibus et ramis 
erectis attenuatis formatus ; cellulis ee is ae Kaa 
cellulis ramorum erectorum eer eastioribus. ayheateas vel aylinition’ 
fusiformibus, diametro 7-18-plo longioribus, cum chromatophoris 
singulis parietalibus, cellulis terminalibus attenuatis vel acutissime 
attenuatis sepe sine chromatophoris. 
17. Pseudocheete gracilis, sp Cellule ramorum repentum 
curt, diametro circiter 1-14-plo igtistaiape ramis erectis gracilibus, 
cellulis diametro 12-18-plo longioribus. Diam. cell. ram. eae 
5°7-7°7 »; diam. cell. ram. erect. 1-5-1°8 p 
Hab. Near Coates, Gloucestershire. 
This genus be to Aphanochate A. Br. 
(et Berth), but differs in the ieee of true septate branches 
instead of simple bristles. These erect branches consist of several 
(5 to 8) distinct a most of etek possess well-marked chromato- 
phores. The latter are parietal and somewhat elongated, an 
ae eae vie the terminal cells of the branches 
longs to the Chetophoracee on account of its 
elenenea | ttiilitedy iigp thallus, the cells of which possess 
parietal chromato ophore : 
The only other vied of the genus is one from Ceylon, which 
