[1] The order was first erected by Petersen for a single genus, Blastocladia, which was originally considered a member of the oomycetes.

Alternatively, members of Blastocladiomycota, Chytridiomycota, and Neocallimastigomycota lumped together as the zoosporic true fungi.

[5] In Allomyces, the thallus (body) is attached by rhizoids, and has an erect trunk on which reproductive organs are formed at the end of branches.

During the haploid phase, the thallus forms male and female gametangia that release flagellated gametes.

[5] Similar to Chytridiomycota, members of Blastocladiomycota produce asexual zoospores to colonize new substrates.

[4] Similar to Chytridiomycota, members of Blastocladiomycota are capable of growing on refractory materials, such as pollen, keratin, cellulose, and chitin.

[5] Of economic importance is Physoderma maydis, a parasite of maize and the causal agent of brown spot disease.