\v. West and C. s. west : alga-floRa of Yorkshire. 63 



Mid W. — Malliam Tarn Bog. Cocket Moss, near Giggles- 

 wick. Cowgill Wold Moss, Widdale Fell. 



N.W. — Cronkley Fell. Bog near Widdale Beck. 

 264. Euastrum lobulatum Br^b. 



[Syn. £. erosum Lund var. notabile West]. 



S.W. — Cragg Vale, towards Blackstone Edge. Keighley Moor. 



Mid W. — Malham Tarn Bog. Cocket Moss, near Giggles- 

 wick. Penyghent. Old Cote Moor. Cam Fell. Whernside. 



N.W.— Mickle Fell. Lund's Fell. 



S.E. — Riccall Common. 



After much consideration we have come to regard the var. 

 notabile we described of E. erosum (cfr. Journ. Roy. Micr. Soc, 

 1892, p. 723, t. ix., fig. 17) as identical with E. lobulatum Brdb., 

 1856. Brdbisson's description and figure are not good, but yet 

 the outward form, the size and the habit, admit of no other 

 conclusion. The frequency of the plant in bog-gatherings, and 

 its constant association with other Desmids that were perfectly 

 familiar to Brebisson, also tend to confirm this view. 



Cfr. also West & G. S. West in Journ. Bot., Aug. 1900, p. 290. 

 265. — Euastrum erosum Lund. 



N.W.— Mickle Fell. 



266. — Euastrum pulchellum Breb. 



S.E. — Riccall Common. 

 267.— Euastrum elegans (Breb.) Kiitz. 



S.W.— Cullingworth. 



Mid W.— Adel (W. B. Turner). Eldwick. Wigton Moor. 

 Malham Tarn. Cocket Moss, near Giggleswick. Bog two miles 

 south of Clapham. West of Selby. 



N.W. — Mickle and Cronkley Fells. 



N.E. — Strensall ! (W. B. Turner). Pilmoor, near Thirsk. 



S.E. — Riccall and Skipwith Commons, 



We regard E. elegans forma dedivis Reinsch, 1867 (placed by 

 Roy as E. declive in 1886) as a mere form of this species, not 

 sufficiently deserving of a definite varietal name, much less to 

 be placed as a distinct species. 



