This turned up in Kyle Doherty's biocrust moss cultures (more on this another time). It's a volunteer. We have not had a look microscopically but I'm guessing a cyanobacterium that was growing on the moss leaf when the culture was started. Its obviously filamentous, maybe one of the Microcoleus species. I guess it could be an alga. The interesting this is this vertical growth habit and the curly pig-tail spires. You don't see something like this happening in crusts out in the field.
Please tell us what you think it might be in the comment box.
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