Achlya diffusa (Harvey) T.W. Johnson in fish ponds in Thailand has bot
h cylindrical and spherical sporangia. The cylindrical sporangia relea
se the primary zoospores into a ball of cysts, the spherical sporangia
release the primary zoospores directly, as motile cells, via exit tub
es which are formed immediately prior to dehiscence. Sexuality is homo
thallic and diclinous and the oogonium usually contains a single oospo
re, which is centric in structure.