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Group of Fungi: Agarics
Latin Name: Lentinellus ursinus (Fr.) Kühner
Common Name: Bear Lentinus
Description: Fan-shaped to kidney-shaped structure; cap 2–12 in (5–30 cm) across and 1/4–1/2 in (0.5–1.3 cm) thick, reddish brown but becoming paler towards the margin, upper surface densely hairy, especially towards the point of attachment; margin of cap incurved; gills closely spaced, dirty white to pinkish brown or tan, edges of gills distinctly saw-toothed; spores creamy white in mass.
Biological Role: Decomposer of wood.
Habitat: On fallen logs and stumps of broadleaf trees, less commonly on conifers; occurring as solitary fruiting bodies or in small groups.
Geographical Distribution: Widely distributed throughout North America.
Comments: The saw-toothed gills are distinctive. Lentinellus vulpinus is very similar to Lentinellus ursinus but has a cap that is pinkish white and a stalk-like base at the point of attachment. Neither fungus should be collected for the table.