Smith—Algae Found in Wisconsin Lakes 
633 
Tetraedron limneticum Borge. 
Bot. Not. 1900: 5. jpL 1,/. 2. 
II. Chetek (r), Island (rr). 
Tetraedron planctonicum G. M. Smith. 
Bull. Torr. Bot. Cl. 43: 479. pi. 26, -jigs. 19-20. 1916. 
III. Devils (sss), Granite (rr), Horseshoe (rr), Prairie (rr). Vermilion (r). 
Tetraedron gracile (Eeinseh) Hansgirg. (Plate 6, fig. 3). 
Hedwigia 28: 19. 1889. 
Polyedrium gracile Eeinseh, Notarisia 3: 502. pi. 7, /. 1. 1888. 
II. Elizabeth (rr). 
Genus POLYEDRIOPSIS Schmidle 1899. 
PoLYEDRioPSis SPINULOSA Schmidle. 
Allg. Bot. Zeitschr. 5: 17. 1899. 
Tetraedron spinulosum Schmidle, Allg. bot. Zeitschr. 2: 193. fig. 2, 1896. 
The general tendency among phycologists has been to place 
this alga in the genus Tetraedron, where it was first described, 
and to consider Polyedriopsis unworthy of specific rank. The 
bristles which are found on the corners of the cells are the same 
type as those found on Lagerheimia and Micractinium and, in 
my opinion, Poyledriopsis forms a genus parallel with Tetraed¬ 
ron just as Lagerheimia does with Oocystis. (Plate 12, figs. 2-5). 
III. Prairie (rr). 
Genus ANKISTEODESMUS Corda 1838. 
Ankistrodesmus falcatus var. acicularis (A. Br.) G. S. West. 
Brit. Freshw. Algae 223. figs 94B-94C. 1904. 
III. Beaverdam (rr), Eice (rr). 
Ankistrodesmus falcatus var. mirabilis (W. & G. S. West) 
G. S. West. 
Brit. Freshw. Algae 224. fig. 94E. 1904. 
III. Bear (rr), Bryer (rr). Devils (rr). Dummy (rr), Horseshoe (rr), 
Eeserve (rr), Whitefish (rr). 
