112 ZYGNEMATACEAE 



90. MoucEOTiA TROPICA (W. & G. S. Wcst) Transcau 1926. Ohio 



Jour. Sci. 26, p. 325, PL 7, Fig. 112. 



Vegetative cells 6-7/1 x 36-56/1; chromatophore with 2 pyrenoids; 

 zygospores unknown; aplanospores obliquely globose with projecting 

 mammillate solid processes, wall yellow-brown, scrobiculate, 27-28/1 x 

 27-29/1, with the processes 42-46/1 in length. (PI. XIX, Fig. 21.) 



Africa, Angola. 



91. MouGEOTiA MiAMiANA Transcau 1934. Trans. Amer. Micros. 



Soc. 53, p. 222, PL 19, Figs. 41-42. 



Vegetative cells 6-^.1 ti x 60-130/1; chromatophores with 2-6 pyre- 

 noids; zygospores unknown; aplanospores formed in the middle of 

 straight or slightly angled cells; outer sporangium wall covered at all 

 stages by a pectic layer; aplanospores globose to ovoid to ellipsoid with 

 projections at either end; globose spores 18-20/t in diameter, ellipsoid 

 spores 16-18/1 x 25-32/1; spore wall yellow, punctate. (PI. XIX, Figs. 

 22-23.) 



United States: Oklahoma, Miami, August 14, 1932 (Taft Coll.). 



92. MouGEOTiA VENTRicosA (Wittrock) CoUins 1912. Tufts Col- 



lege Studies. 3, p. 76. 



Vegetative cells 6-9/1 x 100-140 /i; chromatophores with about 4 

 pyrenoids in a single row; zygospores unknown; aplanospores obliquely 

 ellipsoid to subglobose, 12-24/1 x 16-29/1; spore wall smooth, yellow- 

 brown. (PI. XIX, Fig. 24.) 



United States: Reported from California, Michigan, and Pennsylvania. 

 Have seen no specimens. 

 Sweden; Latvia. 



93. MouGEOTiA PRONA Transcau 1926. Ohio Jour. Set. 26, p. 326, 



PL 7, Figs. 109-11. . 



Vegetative cells 8-12/1 x 60-1 40 (-280) /i; chromatophores 2 with 

 the nucleus between, pyrenoids 4-6 in each; zygospores unknown; 

 aplanospores obliquely ellipsoid with ends produced and truncate, 

 20-24/1 X 5o-52(-6o) /i; spore wall faintly yellow, punctate, with 

 rounded or retuse ends. (PI. XIX, Figs. 26-28.) 



United States: New York, High Hill, Long Island, growing in a road- 

 side spring. 



During the formation of an aplanospore an enlargement of the middle 

 portion of the cell develops. Simultaneously the protoplast begins to con- 

 tract and the 2 chromatophores move into the enlargement, i on each side 

 of the nucleus. The contracted protoplast is cut off from the 2 narrow parts 

 of the sporogenous cell by cross walls. A little later the spore wall develops. 

 Similar stages have been seen in other species of Mougcotia. 



