Abstract
The gut lumen of immature aquatic insects is colonized by a unique community of protistan and fungal organisms, collectively called trichomycetes. The species diversity of fungal trichomycetes appears to be high, with new taxa published regularly. Bactromyces fluminalis and Laculus insecticola , species belonging to two new genera of fungal trichomycetes, are described from stonefly and mayfly nymphs, respectively. Bactromyces fluminalis was collected from a stream habitat in Long Lake Provincial Park, Halifax, Nova Scotia, Canada, while Laculus insecticola was found in a lentic environment (Governor Lake) in Timberlea, Nova Scotia, a suburb within the Halifax Regional Municipality. In addition to these new taxa, a new species, Pteromaktron timberleaense , in this previously monotypic genus is described from the hindgut of a mayfly collected from a stream in Timberlea, Nova Scotia. This discovery makes new material available for study, since it appears the type specimen for this genus is lost.
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