long or subovoid; opening by a superior pore; (44)— 51.8— 52/x. in 

 diameter, ( 75 ) — 88— 90— ( 44 ) /a long. Oospores the same shape as 

 the oogonia, which they nearly fill; wall smooth; ( 42 ) — 48— 49/li 

 in diameter; (50)— 77.7— 81ju long. Antheridia not observed. 

 On submerged grass in a small pond. Wis. 



Oedogonium Kjellmanii Wittrock in Hirn 1900, p. 127 



Macrandrous; dioecious. Vegetative cells cylindric; female 15-22/x 

 in diameter, 45-120/x long; male 14-18/t in diameter, 56-120/a long. 

 Oogonia solitary; obovoid or subellipsoid; opening by a superior 

 pore; (39)-41-47-(50)/i. in diameter, 60-75/a long. Oospores ellipsoid 

 or subellipsoid; the outer layer of the wall ribbed on the inner 

 surface, and the middle layer also, with 35-45 crenulate, anastomos- 

 ing ribs; inner layer smooth; 39-47/x in diameter, 48-57)li long. 

 Antheridia 12-15/x in diameter, 4-12/x long, occurring in series up 

 to 30. 



Typical plant not observed in our collections. 



Oedogonium Kjellmanii var. granulosa Prescott 1944, p. 352 



PI. 30, Figs. 8-10 



Macrandrous; dioecious. Vegetative cells cylindric, 19.5-23.4fi in 

 diameter, 109-1 17/i, long, Oogonia solitary; ellipsoid; opening by a 

 superior pore; 53-55/a in diameter, 97-102ja long. Oospores ellipsoid; 

 not filling the oogonia; wall of 3 layers, the outer smooth, the middle 

 layer with about 22 longitudinal ribs, which are crenulate and 

 granular, frequently interrupted, but not anastomosing; 50.7-53/i, 

 in diameter, 74-76/i, long. Antheridia not observed. 



This plant should be compared with Oe. margaritiferum Nordst. 

 & Hirn, which has similarly marked oospore walls in both the outer 

 and middle layers. The variety differs from the typical form of Oe. 

 Kjellmanii by its larger size and in the markings of the spore wall. 



On old wood in a roadside tarn. Wis. 



Oedogonium Landsboroughii ( Hass. ) Wittrock 1875, p. 35 



PI. 32, Figs. 1, 2 

 Macrandrous; dioecious. Vegetative cells cylindric, stout; (31)- 

 35-40ja in diameter, (74) -85-90- (240) /a long. Oogonia solitary; 

 obovoid or ovate; opening by a superior pore; (62)-63-78/x in 

 diameter, (78)-85-115/x long. Oospores ovoid or broadly ellipsoid- 

 ovoid; wall smooth; (55)-59-70ia in diameter, (68) -73-102^ long. 

 Antheridia (not observed in our collections) 27-35/x in diameter, 

 9-20 fi long. 



[171] 



