MOUGEOTIA loi 



cylindric, with concave ends and sides, formed in the tubes, 55-64 /^ x 

 30-34 m; spore wall yellow punctate; punctations about .8 /a in diameter 

 and evenly spaced over the entire wall. (PI. XVI, Figs. 13-15.) 

 United States: Louisiana, Opelousas, 1938. 



49. MouGEOTiA DEPRESS A (Hassall) Wittrock 1880. SJ^andinaviens 



Vaxter. 4, p. 23. 



Vegetative cells 7-12/A x 35-144JU,; conjugation scalariform and lat- 

 eral; zygospores in the conjugating tubes, compressed-ellipsoid with the 

 longer axis parallel to the filaments, 28-32 /x x 12-14 /x; spore wall 

 brown, punctate. (PI. XVII, Fig. i.) 



United States: Mississippi; Florida. 



British Isles; Germany; Sweden; Luxemburg; Switzerland. 



When the spores are immature there is a distinct pectic layer on the 

 sporangium wall. 



50. MouGEOTiA ovALis (Hassall) Nordstedt 1886. Bot. Notiser 



1886. p. 136. 



Vegetative cells ii-i4iU, x iio-140/u; conjugation scalariform; zygo- 

 spores in the conjugating tubes, compressed-ovoid to subglobose, 

 29-38 /x x 26-36 /x; spore wall finely scrobiculate, brown. (PI. XVII, 

 Figs. 2-3.) 



British Isles; Italy; Germany; Switzerland. 



It seems probable that specimens will be found with a pectic layer on 

 the sporangium walls. 



51. MouGEOTiA PECTosA Transeau 1934. Trans. Amer. Micros. 



Soc. 53, p. 220, Figs. 53-54. 



Vegetative cells 14.5-19,", x i:io-i^oix\ chromatophores with 4-8 

 pyrenoids in a single row; conjugation scalariform, but less frequent 

 than reproduction by aplanospores; zygospores in the conjugating tubes 

 enclosed in a 5-10 /a thick pectic sporangium wall, compressed-globose, 

 26-29 /x ^ 20-22 A*; spore wall colorless, smooth; aplanospores globose to 

 compressed-globose, formed partly within or largely outside the mother 

 cells, 18-21 /x in diameter, when formed outside the mother cell covered 

 with a pectic layer. Spores may not have been fully mature. (PI. XVII, 

 Figs. 4-6.) 



United States: Florida (Tiflfany Coll.). 



52. MouGEOTiA GELATiNosA Wittrock 1 889. Wittfock and Nord- 



stedt Algae Exsiccatae, No. 957. 

 Vegetative cells i2-i8f(. x 1 20-1 80 /x; chromatophores with 3-6 pyre- 

 noids in a single row; conjugation scalariform; zygospores in the con- 

 jugating tubes, compressed-ovoid, 38-47 ju- x 28-39 /x, ^^^ including the 



