Definition for Histoplasma capsulatum
From Biology Forums Dictionary
Histoplasma capsulatum is a dimorphic fungus. The filamentous mould form is found in the environment and can be cultured in conditions below 35ºC using general fungal media. When it is present in tissue or grown in cultures, using brain heart infusion agar or brain heart infusion with blood at temperatures greater than 35ºC, it grows to a yeast form, which appear as small oval buds of 2-4 um. Macronidia are 8-15 μm and are thick walled with tubercles or projections. The micronidia are 2-4 μm and are smooth walled.