UKSMIDS FLORA OF MICHIGAN 
251 
C. hraunii Reinsch. Hoiighton County. 
C. calosporiim var. brosiliense Boerges. Spccimens from Washte- 
naw County are placed here reservedly as they are somewhat 
intermediate between the typical and the variety in measure- 
nients. The general configuration of the cells agréés hoAvevcr 
more closely vvith the variety. 
C. cosiaium var. siibcostafum (Nordst.) Krieger. Except for a very 
slight increase in width, specimens from Barry and Schoolcraft 
Cüunties are in agreement with this variety. 
C. cosiafun} var. westii Cushman. Gogebic County (two stations). 
C. cijnthia De Not. Houghton County. 
C. cynfhia var. robustum (G. S. West) Krieger. Calhoun County. 
C. didijmocotum var. ylubnim Borgc. Rüscoinmon and Schoolcraft 
Counties. 
idiosporiim West and West. ChippeMa County. 
C. inncidiinï var. elongatnm Roy and Biss. Calhoun County. 
C. lineatnm var. costatiim Wolle. Barry and Schoolcraft Counties. 
C. promim Bréb. (PI. 1. Fig. 4). A single specimen with a zygospore 
w'as collected in Bcrrien County and the follow’ing description of 
it a])pears to be the first published account. 
Zygospora transverse rectangiilaris, nmrginibiis abrupte con- 
vesis, angiilis lobos brèves rotundatos in utramqne semicelliilain 
eminentes formantibus; inenibraiia levis, sine colofe. Zygospora 
36.6 diam., 19.A a long. 
Zygosi)ore transversely rectangular, latéral margins sharply 
convex. angles forming short, rounded lobes projecting into 
each semi-cell; wall sinooth and colorless, diameter 36.6 [i. 
length 19.4 y.. Specimens of végétative cells were also collected in 
Chippewa Counties. 
C. ralfsii Bréb. fa. Specimens from Delta county are slightiy 
narrower than typical measurements with the middie tumid- 
ness occupying less of the cell length. 
C. sublatum (Kuetz.) Bréb. Washtenaw County. 
C. subscoUciim Gutw. Livingston County. 
C. venus var. verrucosum (Roll) Krieger. Livingston County. This 
variety is characterized by the presence of small granules, 
which Krieger (1935) States may be the outer part of the pore 
apparatus. Only one specimen was seen by the writer and it 
may hâve been the typical C. venus in some unknown physiolo- 
gical condition. 
c. ulna Focke. Alger and Roscommon Counties, 
