Tapinella atrotomentosa
| Velvet roll-rim | |
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Boletales |
| Family: | Tapinellaceae |
| Genus: | Tapinella |
| Species: | T. atrotomentosa |
| Binomial name | |
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Tapinella atrotomentosa (Batsch) Šutara (1992) |
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| Synonyms | |
| Tapinella atrotomentosa | |
|---|---|
| Mycological characteristics | |
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gills on hymenium |
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cap is depressed |
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hymenium is decurrent |
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stipe is bare |
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spore print is buff |
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ecology is saprotrophic |
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edibility: inedible |
Tapinella atrotomentosa, commonly known as the velvet roll-rim or velvet-footed pax, is a species of fungus in the family Tapinellaceae. Although it has gills, it is a member of the pored mushroom order Boletales. August Batsch described the species in 1783. It has been recorded from Asia, Central America, Europe and North America. Tough and inedible, it grows on tree stumps of conifers. The mushroom contains several compounds that act as deterrents to deter feeding by insects.
Tapinella atrotomentosa was originally described as Agaricus atrotomentosus by German naturalist August Batsch in his 1783 work Elenchus Fungorum, and given its current name by Josef Šutara in 1992. It is commonly known as the "velvet-footed pax", and the "velvet rollrim". Historical synonyms include Paxillus atrotomentosus by Elias Magnus Fries (1833),Rhymovis atrotomentosa by Gottlob Ludwig Rabenhorst (1844), and Sarcopaxillus atrotomentosus by Ivan Zmitrovich (2004). The variety bambusinus was described from Trinidad in 1951 by British mycologists Richard Eric Defoe Baker and William Thomas Dale.
The species name is derived from the Latin words atrotomentosus, meaning "black-haired". It is still commonly seen under its old name Paxillus atrotomentosus in guidebooks.Tapinella atrotomentosa and its relative T. panuoides were placed in a separate genus Tapinella on account of their habit of growing on (and rotting) wood, and microscopic differences including much smaller spore size, lack of cystidia, and differing basidia. Their off-centre stipe also distinguished them from other members of the genus Paxillus, and genetic analysis confirmed them as only distantly related.
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