Distribution: C. muscigenus varies in abundance from year to year, and in some seasons can be very common.
Habitat: mid- to high elevation conifer forests
Conservation Status: Not of concern
Cortinarius muscigenus is a cylindrical-stiped species with a viscid cap and stipe classified in subgenus Myxacium. The myxaciums have a universal veil composed of patches and fibrils that is covered with gelatinous material when fresh and that, in most species, breaks into bands and patches as the stipe elongates. These species can be split into two groups based on the presence or absence of clamp connections. C. muscigenus is a member of the former group, which is related to the secotioid species Thaxterogaster pinguis. It is a medium to large species with a strongly gelatinous, brownish orange to brownish red or ochraceous brown cap, which often is darkest in the center and striate near the edge. The flesh is fibrous, white to yellowish, and typically turns brownish in the lower stipe. The gills are grayish white or grayish brown then cinnamon in age. The stipe is whitish, except for the inner veil which is typically bluish violet, sometimes very faintly so. The spores are almond-shaped and coarsely ornamented. it can be confused with C. trivialis which is a species associated with cottonwoods and aspen, and C. mucosus, a species with a white stipe that most frequently occurs with pines. C. vernicosus is another conifer associate that differs by fruiting in spring.