Abstract
Hirsutella is restricted to spp. producing synnemata. Hirsutella, Tilachlidium and Synnematium are descr. and compared. Descr. of H. fusiformis on Orthoptera; H. citriformis on Homoptera; H. entomophila and H. stylophora on Coleoptera; H. barberi, H. subulata and H. gigantea on Lepidoptera; H. radiata on Diptera; and H. saussurei on Hymenoptera. Tilachlidium ramosum (H. ramosa Mains) is proposed. Synnematium jonesii on various insects is descr. Hirsutella stylophora is the conidial stage of Cordyceps s. Connections of other spp. with ascogenous stages are unknown or doubtful.

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