Type: Gibellula_pulchra (Saccardo) Cavara. Etymology: The genus Gibellula was named after Prof. Giuseppe Gibelli. Description: Pathogenic for spiders, (rarely) insects; teleomorph present or absent. Hyphae regularly septate, usually with roughened surface; usually forming relatively loose subiculum covering host. Conidiogenesis dimorphic with production of (1) penicillate conidiophores, phialidic conidiogenous cells, and short chains of ovoid conidia and/ or (2) irregular, polyblastic conidiogenous cells and bacilliform conidia. Penicilloid state usually synnematous; rarely mononematous. Synnemata clavate to cylindrical, yellowish to greyish to distinctly violet when fresh, becoming brownish with age. Conidiophores solitary and scattered on host body or synnemata, clustered at apex of synnemata, or forming a continuous hymenium on distal portions of synnemata; septate, usually rough-walled; usually with small but distinct terminal vesicle bearing one or two orders of tightly clustered metulae bearing penicillate clusters of conidiogenous cells. Conidiogenous cells phialidic, cylindrical with apices rounded; wall thickened apically; apices rarely extended into short neck; producing short conidial chains. Conidia ovoid, 1-celled. Polyblastic state usually present on subiculum, more commonly formed in absence of synnemata bearing penicilloid conidiophores but occasionally evident on base of such synnemata; almost never present without penicilloid state. Conidiogenous cells arising directly from vegetative hyphae or on inconspicuous stalk, with swollen, irregular apex bearing several raised denticles; each denticle bearing a single conidium. Conidia bacilli-form or rod-like, straight or curved, 1-celled. All species are anamorphs of species of Torrubiella Boudier. Host: Spiders.

Reference:
Petch, T. (1932). Gibellula. Ann. Mycol. 30: 386–393.