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ABSTRACT
Four new species of the hyphomycete genus Gibellula, collected in South America and parasitizing spiders are described. G. mainsii is characterized by mononematous, smooth-walled conidiophores. G. brunnea has typical brown conidiophores borne on bulbiform synnemata and a Granulomanus synanamorph which is produced on well-differentiated conidiophores. G. clavata with its teleomorph Torrubiella clavata n. sp. resembles G. leiopus but has distinctive clavate, paired synnemata. Both stages were regularly collected in cacao plantations in western Ecuador. G. mirabilis has golden yellow paired synnemata with short conidiophores producing fusiform conidia. Both G. clavata and G. mirabilis have Granulomanus synanamorphs. A dichotomous key to the new and accepted taxa is provided.
