Bearish saw-leaf

Bear saw-leaf (Lentinellus ursinus)


  • Department: Basidiomycota (Basidiomycetes)
  • Subdivision: Agaricomycotina (Agaricomycetes)
  • Class: Agaricomycetes (Agaricomycetes)
  • Subclass: Incertae sedis (undefined)
  • Order: Russulales
  • Family: Auriscalpiaceae (Auriscalpiaceae)
  • Genus: Lentinellus (Lentinellus)
  • Species: Lentinellus ursinus (Bear's saw-leaf)


  • Lentinellus bearish

  • Bearish saw-leaf
  • Agaricus ursinus
  • Lentinus ursinus
  • Hemicybe ursina
  • Pocillaria ursina
  • Resupinatus ursinus
  • Panellus ursinus
  • Pocillaria pelliculosa

Lentinellus ursinus - Lentinellus ursinus


This species of Lentinellus is called 'Bear's pilleaf', this is how its Latin name is translated. But what old man Elias Fries was thinking we cannot understand. Nothing in Lentinellus ursinus looks like a bear to me— Except for the bearish headache associated with its identification. Michael kuo

The main question of identification is the difference between Lentinellus ursinus (Bear Sawfoot) and Lentinellus vulpinus (Wolf Sawfoot). Theoretically, Lentinellus vulpinus differs, in particular, in the presence of a leg, but its leg is rudimentary, it can be overlooked, in addition, it may be completely absent. An attentive mushroom picker can see differences in color between the two species (in particular, the surface of the cap and its edge), but these features overlap, and the fungi show significant variability even during development. Summary: It is extremely difficult to distinguish these species without a microscope.

Lentinellus ursinus - Lentinellus ursinus

Hat: up to 10 cm in diameter, kidney-shaped to conventionally semicircular. In youth it is convex, with age it becomes flat or depressed. Slightly pubescent or velvety, over the entire surface or more abundantly at the base, by about a third. The edge is whitish, later darkens. The edge is sharp, wrapped when dry. The color is brown, paler towards the edge, cinnamon-brown when dry, can acquire wine-red shades.

Plates: White to pinkish, darken with age and become brittle. Frequent, thin, with a characteristic serrated edge.

Lentinellus ursinus - Lentinellus ursinus

Leg: absent.

Flesh: light, light cream, darker with age. Tough.

Taste: Strongly pungent or peppery, some sources indicate bitterness. Odor: odorless or mild. Some sources describe the smell as 'spicy' or 'offensive, sour'. In any case, different sources agree on one thing: the smell is unpleasant.

Spore powder: white, creamy white.


Bear sawnose is considered inedible because of its bitter, pungent taste. No data on toxicity.

Season and distribution

Saprophyte, grows on hardwood and rarely on conifers. Widely distributed in North America, Europe, throughout Russia. Fruiting from late summer to mid-autumn.

Similar species

An inexperienced mushroom picker can mistake a bear's saw-leaf for an oyster mushroom. Wolfsweed (Lentinellus vulpinus) – very similar in appearance, characterized by the presence of a short, rudimentary eccentric leg, under the microscope – the absence of an amyloid reaction on the pulp hyphae and, on average, larger spores. Beaver sawnose (Lentinellus castoreus) – also similar in appearance, on average with larger fruiting bodies, the surface at the base without pubescence, grows mainly on coniferous substrates.

Elias Magnus Fries (Swedish. Elias Magnus Fries, 1794-1878) – Swedish botanist and mycologist, 'the father of mycology'. Author of the names of a number of botanical taxa. In the botanical (binary) nomenclature, these names are supplemented by the abbreviation 'Fr.' Note of the translator.

Photo: Alexander.

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Hunting, Fishing and Mushrooms: a magazine for hunters and fishers.
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