Abstract
Diagnostic characteristics are provided for two new species, Myxotrichum thaxteri and M. conjugatum. The morphological development of these two species is discussed and illustrated. The formation of ascogenous hyphae and croziers precedes the production of asci. A comparison is made of the gametangial types represented in Myxotrichum uncinatum, M. thaxteri, M. emmonsii, and M. conjugatum. The value of gametangial morphology in taxonomy is discussed.

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