Abstract
On the basis of study of collections of aquatic hyphomycetes from the eastern U. S., a partial report is given on the spp. indigenous to that area. Keys to the described genera, and to the spp. of appropriate genera, are given. Monosporella microaquatica (Tubaki) is proposed as a new combination. The following new taxa are proposed: Articulospora angulata f. tetracladia, Centrospora angulata, INGOLDIA craginiformis, Tricladium eccentricum, T. intermedium, and Triscelophorus magnificus.

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