MONOBLEPH ARID ALES 723 



Antheridium either terminal on a branch subtending the oogonium and 

 cylindrical, 20-45 \i long by 3-5 u, wide, or hypogynous and geniculate, 

 consisting of a cylindrical section of the suboogonial hypha 2-19 \x long 

 and a beaklike lateral outgrowth 10-35 \l long by 3-5 jx wide. Anthero- 

 zoids four to seven, emerging through a pore at the apex of the antherid- 

 ium, strongly amoeboid, ovoid when swimming, 5-6 jx long by 3-4 \x 

 wide, with an anterior group of small refractive globules, posteriorly 

 uniflagellate, the flagellum up to 20 u, in length. Zygote spherical or 

 broadly ovoid, 9-13 [x long by 8-10 \x wide, posteriorly uniflagellate 

 free swimming or during rest periods strongly amoeboid, containing 

 large refractive globules. Oospore formed free in the water, or occasion- 

 ally retained within or at the orifice of the oogonium, 9-12 u. in diameter, 

 with a light brown, smooth wall up to 1 [x in thickness, contents bearing 

 globules, upon germination forming a mycelium" (Springer, loc. cit.). 

 In soil, hempseed bait, coll. C. D. LaRue, Mexico; soil, coll. M. E. 

 Springer, United States. 



MONOBLEPHARELLA MEXICANA Shanor 



Mycologia, 34: 242, figs. 1-20. 1942 



"Mycelium well developed, hyphae delicate, 1.5-5.5 u. in diameter, 

 much branched, branches usually growing almost at right angles to the 

 main hyphae, contents reticulately vacuolated; sporangia narrowly 

 cylindrical or siliquiform, variable in size, 40-95 \x in length by 6.5-10 \x 

 in diameter [23-92 \x x 9.4 \x] l at the widest point, occurring singly or 

 in clusters due to marked sympodial branching of the supporting hypha; 

 zoospores ovoid to subcylindrical, 6.6-10 [j. long by 4-5 \x in diameter, 

 posteriorly uniciliate, cilia up to 36 \x long; oogonia at first terminal 

 but often becoming lateral due to the sympodial branching of the 

 supporting hypha, obpyriform with somewhat rounded apex and a 

 narrow cylindrical base, 14-17 ix long by 9-15 \x in diameter, tapering 

 to 2-4 [x at the base, containing usually a single egg in which there are 

 numerous large refractive globules; antheridia terminal or after sym- 

 podial branching of the supporting hypha appearing lateral, narrowly 

 cylindrical or fusiform, 14-16 \x long by 4 6.5 \x in diameter [1 1-25 ; 



1 Springer (1945b). 



