Public Description of Inocybe sensu lato

Title: Public Description
Name: Inocybe sensu lato
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Inocybaceae


General Description:

Our specimens fit nicely into the I. dulcamara clade described in the broad sense (Favre’s forme Typique). Specimens are typically pale ocher with rather smooth cap, olive yellowish gills, fibrous ocher stipe, white stipe base, with an odor of burnt sugar. The Beartooth specimens with a white peronate sheath and 2-spored basidia group molecularly with 4-spored specimens. This taxon is apparently widespread in the Rocky Mountains alpine zone and is known from other arctic-alpine areas with willows. It is also reported from subalpine areas and with aspen in the Rockies (Cripps 1997).


Diagnostic Description:

Pileus 15-45 mm in diameter, at first hemispheric or with low umbo, becoming broadly convex, umbo remaining or not, to applanate with low boss, or flat or sunken in center, uniformly pale ocher (dull yellow brown) but not dark colors, often with olive tint, rather smooth to indistinctly radially fibrous; margin incurved when young, later turned down or in, and entire. Lamellae broadly adnate or subdecurrent when young, often narrow, pale yellow brown at first, then yellow brown (ocher) with olive tint, edges can be paler. Cortina cobwebby, pale whitish buff, pale yellowish, fugacious or leaving a few fibrils that can adhere to margin of young specimens.

Stipe 15-40(60) mm long x 3-6(8) mm wide, equal, can be rather long, undulating slightly or not, dull yellow brown, whiter at base, surface rough-fibrous, somewhat floccose at apex, in some collections with persistent white peronate sheath that flares upward, white at base in most cases, stuffed or hollow, tough. Context white in cap, watery yellow brown in stipe; odor of burnt sugar, honey-like. Basidiomes dry pale yellow brown with olive tint (no yellow at base).

Spores brown, 8.5-11.5 × 5-6 μm, on average 10.7 × 5.4 μm, larger for 2-spored basidia up to 17 × 7.5 μm, smooth, subphaesoliform to sub-amygdaliform, with conic or obtuse apex. Basidia long, clavate, 30-60(85) x 8-12(19) μm, mostly 4-sterigmate, in some collections mixed with 2-sterigmate basidia. Pleurocystidia absent. Cheilocystidia clavate, cylindrical, 15- 35(-50) x 6-15(-28) μm, pale, thin-walled. Clamp connections present.

Ecology: alpine zone with mixed dwarf (S. reticulata) and shrubby willow (S. glauca, possibly S. planifolia), CLC 1581 was possibly with Dryas.

Source – Subgenus Mallocybe (Inocybe) in the Rocky Mountain alpine zone with molecular reference to European arctic-alpine material.


Description author: Image Sharer (Request Authorship Credit)
Description editor: Joseph D. Cohen


Created: 2018-12-25 21:45:37 EST (-0500) by Image Sharer (image sharer)
Last modified: 2019-12-26 12:24:16 EST (-0500) by Joseph D. Cohen (Joe Cohen)
Viewed: 6 times, last viewed: 2020-01-27 19:27:15 EST (-0500)