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74
ZYGNEMATACEAE
among the Zygnemataceae. Skuja's figures are the only ones that
accurately represent cither the vegetative or the reproductive
structures.
Description of Species
MouGEOTioPsis cALospoRA Palla 1894. Berichte deutsch. hot.
Gesells. 12, p. 228. Skuja. Acta Horti Bot. Vnw. Lat-
viensis. 1, p. 45, PI. 2, Figs. 19-26. 1929.
Vegetative cells cylindric, io-18/x x lo-yoju. with plane end walls;
I axial chromatophore with the nucleus beside it in the center of the
cell; fertile cells similar or somewhat longer; conjugation scalariform;
zygospores often irregularly placed and irregularly ovoid to quadrate-
ovoid 16-2 v^ X iu.; 21-38 outer wall thin, transparent; median wall
thick, deeply and sharply scrobiculate; pits 1.5-2.5 m in diameter, light
yellow to brown in color. (PI. XII, Figs. 16-17.)
United States: Wisconsin (Prescott Coll.); Michigan, Douglas Lake
(Ackley Coll.).
Southern Bavaria; Austria; Czechoslovakia; Latvia.
In the American specimens I found conjugation occurring between
filaments of all the various diameters so that it seems inadvisable to separate
the smaller and larger forms as has been suggested by some authors.