292 THE JOURNAL OF BOTANY 
41. ——— peRicyMATIUM Nordst. var. EBORACENSE, var. 
(Fig. 4.) Var. minor; semicellulis cum undulis paucioribus t 
stonenentionibns membrana punctata. Long. 21 p; lat. 14 p; 
lat. isthm. 10 »; crass. 12 
Hab. a pee W. Yorks. 
12. Cosmar subtrinodulum, sp. n. (Fig. 1 C. sub- 
mediocre, coma longius quam latum, profunde cence: sinu 
nulo serobiculorum parvorum et nonnullis scrobiculis parvis 
. . is ‘ . hs 
n medio utrobique subin ate et leviter trinodulose ; membrana 
— a A475 pw; lat. oe p; lat. isthm. 11°5 »; crass. 27 p. 
rel 
ness, Wexten 
This ain approaches prvomte to C. tga Nordst. (in 
Acta Univers. Lund, 1880, vol. xvi. p. 5, t.i. but differs in its 
rounded basal angles, in the disposition of a sealed at the upper 
art of 
/ : 
lations round these nodules, in the inflated piadieals view, and the 
thickened cell-wall. 
13. CosmarIumM Nordst (i. c. 1880, p. 5, t.3& 3). 
Var. mepiogeMMatum nob. [Syn. C. mediogemmatum West & G. 8. 
West, ‘ Welw. Afric. Freshw. Alg.,’ Journ. Bot. 1897, p. 118, t. 367, 
£, 11.] As C. mediogemmatum has such a close affinity wit th C. hetero- 
chondrum, we have come to the conclusion that it had better stand 
as a variety of that species 
14. Cosmarrum tRiLoBuLATUM Reinsch, forma Schmidle in Eng- 
ler’s Botan. oe i Bd. 26, Heft 1, 1898, t i. f. 8. This form 
figured by Schmidle does not belong to C. trilobulatum Reinsch (in 
Abhandl. Natushistor. Gesellsch. Niirnberg, Bd. 3, 1866, p. 116, 
t. ix. f. via-d), but !, Hammeri Reinsch, ia especially near 
the ees figured by tial tc. t. &. f. Th, 
. Cosmarium PokoRNYANUM Grun.) i. [Syn. Euastrum 
E 
ad. Handl. 1872, Ba. 1: no. 1, p. 50, “8 8; e polare 
Nordst. in ufvers. af K. Vet.-Akad. Forh, 1872, n no. 6, P. Tie vii. 
ame. It is a plant 
ich has scarcely ever been rohrad i under the name of 
E. Pokornyanum, owing most probably to the brevity and meagre- 
ness of its peeees dosripi on. On careful consideration, however, 
we find that Gruno deen agrees in od way with that of 
C. ee (or E. polare). 
