54 Transactions of the Royal Society of South Africa. 
Samples 24 (rare), 36 (common, here like var. conspicuum (Hass.), 
Kirchn.). 
Lat. cell, veg., 27 (sample 36) or 30 fx (sample 24) ; cells about twice as 
long ; dimensions of zygospores, 40 x 33 (sample 36) or 40 x 36 /x (sample 
24). 
Fig. 24. — Zygnema pectinatum (Vaticli.), Ag-. A. Filaments showing both 
scalariform and lateral conjugation. B. Kidney- shaped zygospore, produced 
by lateral conjugation. C. Zygospore showing the characters of the 
membrane, x 500. 
The material in sample 36 contained very plentiful conjugating filaments 
and zygospores, the bulk of the latter being immature ; here and there, 
however, typical mature spores, spherical or slightly elliptical in shape, with 
a brown and reticulate middle membrane were encountered (Fig. 24, C). 
The material was peculiar in the fact that many of the threads exhibited 
lateral conjugation, with formation of the zygospore, as in the ordinary 
method, in the middle of the conjugation-canal (Fig. 24, A), lateral and 
