A. Reproducing by dividing within parent cells, not
producing motile spores; unbranched thallus
Single species; Hyaloraphidium curvatum Korsh.
A’. Reproducing
sexually and/or by zoospores
a.
Reproducing only by zoospores; thalli simple, unbranched……………..…..B
a’. Reproducing sexually and by zoospores; thalli mycelial……..………...……C
B. Zoospores formed in simple thalli;
exiting from an apical or subapical pore; sporangia
proliferating internally from basal protoplasm
Harpocytriaceae
Single genus; ~9 species; Harpochytrium
B’. Thalli
large, 20 – 37 µm dia , 0.5 - 1 cm long; sporangia
formed by division of thalli into segments by cross
walls starting at the distal end; thalli not
proliferating internally
Oedogoniomycetaceae
Single genus, single species; Oedogoniomyces lymnaeae Kobayashi and Okubo
C. Hyphae without pseudoseptations
Monoblepharidaceae
a.
Mycelium robust (usually 9—16 µm dia); mature oospores remaining inside or at the mouth of the oogonium
8—10 species; Monoblepharis
a’. Mycelium finer (1—7.5 µm;
typically 2—3 µm dia); oospheres
emerging from the oogonium propelled by the
flagellum of the partially absorbed male gamete.
Fertilization completed and oospore formed
at a distance from origin.
5 species; Monoblepharella
C’. Hyphae pseudoseptate
Gonapodyaceae
One genus; Gonapodya
Two species; G. prolifera
(Cornu) Fischer and G. polymorpha
Thaxter
Return to Monoblepharidales