Keinstirschia is a genus of fungi in the order Diaporthales, class Sordariomycetes.
The relationship of this taxon to other taxa within the order is unknown (incertae sedis).
[1] A monotypic genus, Keinstirschia contains the single species Keinstirschia megalosperma, originally described as Cryptosporella megalosperma by German mycologist Wilhelm Kirschstein in 1939.
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