''Paxillus filamentosus'', commonly known as the alder roll-rim, is a

basidiomycete Basidiomycota () is one of two large divisions that, together with the Ascomycota, constitute the subkingdom Dikarya (often referred to as the "higher fungi") within the kingdom Fungi. Members are known as basidiomycetes. More specifically, Basid ...

fungus A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one ...

which is associated with alder (''

Alnus Alders are trees of the genus ''Alnus'' in the birch family Betulaceae. The genus includes about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species ext ...

'') in northern Europe and southwestern

Greenland Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...

, and North America. It closely resembles ''

Paxillus involutus ''Paxillus involutus'', also known as the brown roll-rim or the common roll-rim, is a species of basidiomycete fungus. Although it has lamella (mycology), gills, it is more closely related to the pored boletes than to typical gilled mushroom ...

'', but its fruit bodies are generally smaller. Some sources regard ''Paxillus rubicundulus'' as a synonym, but MycoBank and Index Fungorum treat it as different species.

References

External links

* {{Taxonbar, from=Q4458295 Paxillaceae Fungi described in 1772 Fungi of Europe Fungi of North America Fungus species