SOME DESMIDS OF THE UNITED STATES, 291 
The variable species so very badly described and figured by 
Wolle as E. Nordstedtianum is without question Æ. evolutum, as 
specimens of an Euastrum received from him from Minneapolis, 
Minnesota (one of the most abundant habitats of E. Nordstedt- 
ianum, cfr. Desm. U. S. p. 106), are identical in all respects with 
E. evolutum. The figures of front, vertical, and lateral views 
given by Wolle are too crude and inaccurate to be of any value. 
E. coronatum, W. B. Turner *, of which we possess the original 
(and numerous) examples, is also this species in its most typical 
form; Turner's figure and description are incorrect. It is also 
rather remarkable tbat the specimens described as E. coronatum 
by Turner came originally from the late Rev. F. Wolle, and are 
from the same locality as those described by the latter as 
E. Nordstedtianum. 
Fig. 1.—All x 520. 
aetb. Euastrum evolutum, West & G. S. West. 
^ o» » » forma minor. 
dete ” » var. integrius, West & 
G. S. West. 
f. » pictum, Bórg., var. subrectangulare, n. var. 
* In No rdstedt's Index Desmid. (1896), p. 234, E. coronatum is placed as a 
*ynonym of E. simplex, Wolle; we cannot quite comprehend how such an 
obvious mistake arose, 
