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ZYGNEMATACEAE
PLATE X
Hallasia and Zygogonium
Figs. 1-9. Hallasia reticulata, vegetative cells and aplanospores. In
some of the aplanospores secondary spores are formed which are released by
the separation of the two valves of the aplanospore wall. In Fig. 9 a several-
celled sporeling is depicted. After Hallas. Figs. 10-16. Zygogonium
ericetorum, vegetative cells, akinetes, aplanospores, and zygospores in various
stages of development. All but Fig. 14 are from Longwood, Florida. In
Fig. 14 are filaments with an aplanospore and three encysted and united
gametes, from Kwangtung, China. Figs. 17-19. Z. mirabile, zygosporangia
and vegetative cells from Portuguese West Africa. After G. S. West.