Validation and phylogenetic placement of Blastocladiopsis parva (Blastocladiomycota)

Blastocladiopsis parva was originally placed in Blastocladia, and was later segregated out based on resting spore morphology. Later authors showed these characters were not sufficient to delineate a new genus and advocated using physiology and growth form but did not formally amend the generic description. As it is, the original species description was in English, not Latin, making it an invalid name. Using an isolate obtained in Alabama and amplicon based next generation sequencing, we place Blastocladiopsis parva in a molecular phylogeny, which confirms separating it from Blastocladia. We validate the species description and amend the generic description to include growth form and physiology.