66 ZYGNEMATACEAE 



igan, GDlorado, and Utah. Also in Canada from western Ontario to Nova 

 Scotia. Probably occurs throughout the northern and western provinces. 



Reported from all the continents. 



In terrestrial forms the cell sap may be purple, the cells somewhat 

 smaller, and the walls thick, lamellate, and colored yellow or brown. In a 

 collection from Kwangtung, China, the sporangia had a distinct outer pectic 

 layer. 



2. Zygogonium mirabile (W. & G. S. West) Transeau 1933. Ohio 



Jour. Sci. 33, p. 158. Jour. Bot. 35, p. 39. 1897. 



Vegetative cells 12-13.5^ x 18-50^1; chromatophores 2, rather indis- 

 tinct, each with a central pyrenoid; conjugation scalariform; zygospores 

 formed in the enlarged conjugating tubes, which are walled ofT from 

 the original cells; sporangium ovoid with prominent equatorial suture; 

 spores filling the sporangium, ovoid, 13.5-17/i. x 19-32^1., smooth, but 

 possibly immature in the one known collection. (PI. X, Figs. 17-19.) 



Portuguese West Africa, Huilla, April, i860 (Welwitsch Coll.). 



3. Zygogonium pectosum Taft 1944. Ohio Jour. Sci. 44, p. 238. 

 Vegetative cells 9-12 /a x 12-108 /x, with 2 pillow-shaped chromato- 

 phores, sometimes elongate with flat ends; conjugation scalariform and 

 lateral; zygospores formed in the greatly enlarged tubes; zygospores 

 globose or subglobose (15-) 20-25/1 x 18-25/1, with a smooth, slate-blue 

 wall; aplanospores cylindric-ovoid, 9-10/1 x 12-16/1, also slate-blue; 

 sporangium outer wall a 2-4/1 layer of pectic compound. During con- 

 jugation the cells elongate and the walls change to pectic compounds 

 and become greatly thickened. (PI. XI, Figs. 1-3.) 



United States: Louisiana, near Hornbeck on wet seepage slopes, April, 

 1940. 



4. Zygogonium hansgirgii (Schmidle) Transeau 1933. Ohio 



Jour. Sci. 33, p. 159. Hedivigia. 39, p. 160. 1900 (as Zyg- 

 nema hansgirgii). 

 Vegetative cells 8-12/1 x 30-60/1, irregular; filaments short; conju- 

 gation unknown; aplanospore variable, ovoid, about the same diam- 

 eter as the cells; median wall brown, with small angular protuberances 

 (vcrrucose). (PI. XI, Figs. 4-6.) 

 India, Igatpuri, 1895. 



5. Zygogonium talguppense Iyengar 1932. Rev. Algolog. 6, 



pp. 263-74. 

 Filaments forming a thick felt on soil, increasing in width up- 

 wards, often branching below; lower cells of the filament 12-16/1 x 

 30-60 /t, the upper 17-20/1 x 30-90/1; conjugation unknown; apian- 



