SUMMARY: The occurrence and distribution of Saprolegniaceae in and around Marion Lake, British Columbia, Canada, has been investigated by single-core samples and transects in order to determine the principal sites of activity of these fungi. The lentic muds under 1 m. or more of water are generally very poor both in number of species and abundance. The marginal lentic muds are richer but reflect the flora of the emergent littoral muds. It is probable that many of the lentic mud records are for alien spores originating either from the open water community or the emergent littoral flora. These findings are discussed in relation to a general theory of fungi in the lake ecosystem. The majority of Saprolegniaceae are to be regarded as fungi of the emergent littoral. The distinctive acidophile community has again been recognized.


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