Teleomorph state: Ophiocordyceps dipterigena (Berk. & Broome) G.H. Sung, J.M. Sung, Hywel-Jones & Spatafora

Specimens were found on the underside of leaves of forest plants. Hosts are dipteran flies (especially Asilidae and Calliphoridae). Synnemata solitary, arising from posterior abdomen of host, 50-100 mm long, 0.5-1 mm wide, brown to dark brown at the base, light brown to cream white toward the apex, composed of longitudinal, more or less parallel, closely compacted hyphae. Hyphae hyaline, slightly thick-walled, smooth. Conidiophores arising from hyphae of synnemata, forming a hymenial layer, consisting of clavate, cylindrical basal parts, and solitary, 10-20 x 2-3 μm. Conidia hyaline, smooth, ellipsoid to obovoid, occasionally broadly fusoid, one-celled, 3.5-7 x 2-3 μm. Conidia germinate in 24-36 h on PDA to produce slow-growing grey-white colonies becoming irregularly grey-brown with age. Colonies take ca. 2 mo to grow 2-3 cm at 25 oC. Colonies remain sterile. This species is rather common in Thailand. The specimens invariably have two perithecial clavae and one conidial synnema. The flies usually appear cemented to the underside of leaves by a pad of mycelium emerging from the abdomen. Mycelium also emerges from the mouthparts and feet to further fix the fly to the leaf.

Petch, T. (1932). Notes on entomogenous fungi. Transactions of the British Mycological Society 16: 209-245.