Histoplasma species have two forms: their environmental form is hyphal with microconidia and tuberculate macroconidia while their pathogenic form is a small intracellular yeast with a narrow neck and no bud with no capsule.
Histoplasma species exhibit two forms: their environmental form is a hyphal structure with microconidia and tuberculate macroconidia, while their pathogenic form is a small yeast cell within cells, lacking a bud, capsule, or neck.