Lily Lake, a subalpine lake in the Wasatch National Forest Tl5, R9E, S31, of the Uinta Mountain Region, Utah, is located about one-half mile west of Trial Lake at an elevation of 10,000 feet. This Lake, which is one of the acidic, cold, lentic bogs characteristic of this area, has been selected for a taxonomic and seasonal distribution study of acquatic phycomycetes. This study is a beginning to our knowledge of the role of the fungi in the hydrobiology of Lily Lake and will supply the first information on record of the water molds of this area. The study identifies the fungi found on fourteen types of substrata and correlates it with the environmental data of the lake.

Fungi imperfecti were cultured from water and bottom sediment samples collected at four locations of Utah Lake. These study sites included: (a) The mouth of Provo River, the largest fresh-water tributary entering Utah Lake, (b) Mud Lake, a large shallow area known for its high nitrogen content, (c) the entrance of the Spanish Fork River into the lake, a large fresh-water tributary containing wastes from industry and agricultural enterprises, (d) Jordan River, the only natural outlet of Utah Lake. One hundred and thirty-eight species of fungi imperfecti were identified. A total of 89 species were isolated from the Spanish Fork River, 107 species from Mud Lake, 82 species from the Provo River, and 60 species from the Jordan River Outlet. Species that were restricted to a particular area included, 16 from the Spanish Fork River, 17 species from Mud Lake, 7 species from the Provo River and 6 from the Jordan River Outlet. The total number of fungi cultured from each station was in a direct relationship to the percent organic matter present. Seven species of Aspergillus which are potential human and animal pathogens were identified. Potential plant pathogenic fungi identified included 22 species.

Aquatic fungi in-Powell's Slough were.studied in 1967 & 1968. Collections were made and water temperature, oxygen content & pH values were measured at weekly intervals. For collections, wire baskets containing substrata were submerged in water for one month. After collecting, substrata were brought to the laboratory. Identification was based on the keys of Sparrow, 1960. Aquatic fungi identified included seven orders, nine families, fifteen genera, and thirty species, from thirty-three collections of fifteen types of substrata. The substrata used in this study were: (i) fruits: apples, rose hips, plums, pears, haws; (ii) twigs: poplar, weeping willow, river birch, weeping white birch, pine, sumac, roseleaf mountain ash; (iii) others: algae, snake skin, fish head. Blastocladia pringsheimii was the predominant species, found on twelve different types of substrata. The number of species increased both in spring and in autumn, and decreased in summer.