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Sepedonium chrysospermum

Spededonium chrysospermum is the asexual (or conidial, or anamorphic) state of the sac fungus Hypomyces chrysospermus (Pyrenomycetes, Ascomycota).  The spores are one-celled aleuriospores that originate as blown out ends of short, lateral, fertile branches.  The mature spores (conidia) are large spherical, thick-walled, yellow, and have a roughened, warty (tuberculate) outer wall.  They are produced in such abundance that infected mushrooms are covered with a powdery layer of yellow spores (click here).