There is currently only one known species of Geodermatophilus: Geodermatophilus obscurus . Its description was first published in September 1968 by George Luedemann in the Journal of Bacteriology. He described the bacteria as readily grown on agar media with the production of black, sooty colonies. They were discovered while isolating microorganisms from soil samples taken from Amargosa Desert of Nevada. Microscopically they appear to be "composed of greenish-black, cushion aggregates of small, cuboidal cells". Three subspecies are recognized: Geodermatophilus obscurus subsp. amargosae, Geodermatophilus obscurus subsp. utahensis, Geodermatophilus obscurus subsp. dictyosporus.
I believe picture 25 represents a strain of this genus.
I agree this picture looks like it could be a strain of Geodermatophilus, but it also look kind of brownish like the picture of M.versicolor which was in the last person's blog!
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