Ascosphaera

 ( Onygenales ) 

Ascosphaera is a genus of fungi in the family Ascosphaeraceae. It was described in 1955 by mycologists Charles F. Spiltoir and Lindsay S. Olive. Members of the genus are insect pathogens. The type species, Ascosphaera apis, causes chalkbrood disease in . The reproductive of the fungus are produced within a unique structure, the spore cyst, or sporocyst.

• A. acerosa
• A. aggregata
• Ascosphaera apis
• A. asterophora
• Ascosphaera atra
• A. callicarpa
• A. celerrima
• A. cinnamomea
• A. duoformis
• A. fimicola
• A. flava
• A. fusiformis
• A. larvis
• A. major
• A. naganensis
• A. osmophila
• A. parasitica
• A. pollenicola
• A. proliperda
• A. scaccaria
• A. solina
• A. subcuticularis
• A. tenax
• A. torchioi
• A. variegata
• A. verrucosa
• A. xerophila