Simple new test for rapid differentiation ofPrototheca stagnora fromP. wickerhamii andP. zopfii

Abstract
A simple new test to differentiatePrototheca wickerhamii andP. zopfii fromP. stagnora by determining susceptibility to neomycin is described. Susceptibility determined using a 30 µg neomycin disk provides a rapid and reliable means of distinguishingP. wickerhamii andP. zopfii fromP. stagnora.