A Re-Evaluation of Myxotrichum Spinosum and M. Cancellatum

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Abstract
SUMMARY Myxotrichum cancellatum Phillips and Myxotrichum spinosum Massee & Salmon represent the same fungus which is redescribed in a new, monotypic genus as Toxotrichum cancellatum. Among the other genera of Gymnoascaceae, Toxotrichum is most similar to Myxotrichum since both genera form dark colored ascocarps bearing elongated, septate, dark appendages. Both produce hyaline to pale yellow, fusoid to navicular or elliptical ascospores. Toxotrichum may be distinguished from Myxotrichum by several characteristics. Appendages in Toxotrichum are superficial in origin, arising from arched peridial elements at the periphery of the ascocarp, while appendages in Myxotrichum arise near the center of the ascocarp. In Toxotrichum the tuberculate peridial hyphae are unbranched and anastomosed more or less dichotomously or trichotomously to form a network with the only free ends represented by elongated appendages. In Myxotrichum the peridial hyphae are repeatedly branched, with numerous free ends, and with the main axes of the elements radiating outward from the central group of asci, rather than forming a network about them. The asexual state of T. cancellatum is represented by an Oidiodendron stage.

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