Name: Russula grossa Berk.
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First person to use this name on MO: Danny Newman
Editors: Image Sharer

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Rank: Species

Status: Accepted

Name: Russula grossa

Author: Berk.

Citation: Hooker’s Journal of Botany and Kew Garden Miscellany 3: 42 (1851)


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Russulales

Family: Russulaceae

Genus: Russula

Notes on Taxonomy: [Edit]

Pileus 4 inches across, cup-shaped, viscid, spotted with innate darker scales; margin narrowly involute, rather rugged. Stem about 3 inches high, 3/4 of an inch thick, nearly equal, obtuse. Gills decurrent, broader in front, entire.
Well characterized by its viscid, spotted pileus and coarse habit. Dr. Hooker compares it with Ag. verriucarius, Berk. The gills are yellowish when dry, but I cannot ascertain the colour of the spores.

Brief Description: [See More | Edit]

Russula grossa sensu Bills & Pegler 1988 ac sensu Saini & Atri 1982, non Berkeley 1851.
(Fig. 2) Fruit bodies up to 10 cm high. Pileus up to 9.5 cm diam., infundibuliform with involuted, irregular to almost wavy margin; surface dry with pruinose fibrillose scales, yellowish white (1A2). Gills decurrent, crowded, equal but dichotomously forked, broad, yellowish brown (5D8), unchanging when bruised; edge entire, concolorous. Stipe up to 3.7 × 2 cm, central, stout, tough, broad above and tapering below, white, pruinose, solid, unchanging when bruised. Flesh white, unchanging, not exuding milk on injury. Taste bitter. Odor disagreeable. KOH on cap surface orange yellow. Phenol on cap surface coffee brown. Spore print pale orange (5A3). Exsiccatum pale isabelline, gills dark reddish brown without cristalline paler deposits on gill
Spores very small, ellipsoid to almost
larmiformous, (5.9)6-6.39-6.8(7.1) × (4.3)4.5- 4.79-5.1(5.5) μm, Q = (1.24)1.34(1.44); ornamenttation overall low, composed of small convex warts interconnected or incompletely so by fine lines or forming short crests, some warts nevertheless very distinct and strongly amyloid; suprahilar spot inamyloid but distinct. Basidia short, (30)35-46 × 6.5-8 μm, stout, sinuous to shortly clavate, widest at the tip, 4- spored; sterigmata stout for their small size. Cystidia large, 77-160 × 9-22 μm, imbedded or hardly projecting above the basidia-level, fusiform-lageniform, minutely capitate to rostrate, often strongly inflated near or below the trama-subhymenium transition, thin-walled, with rather poor crystalline contents. Pseudocystidia not observed. Marginal cells not or hardly differentiated, some elements more inflated near the tip and broadly capitate. Subhymenium difficult to observe due torapidly collapsing cells, taking hardly any color in Congo Red. Lamellar trama almost without sphaerocytes, a dense tissue of slender hyphae. Pileipellis poorly developed, entirely ortho- chromatic in Cresyl blue, single layered, a thin cutis of entangled, narrow and very thin- walled, easily collapsing hyphae measuring 3-5 μm diam., sparsely septate, simply rounded at the tip, not strongly ramifying. Pileocystidia absent. Pseudocystidia not observed, but the majority of the hyphae just underneath the cap surface have an oleiferous aspect, although their contents are probably of a different nature being strongly refringent and locally appearing as if perforated possible as the result from deposition of some substance. Typical oleiferous hyphae are present in deeper layers. Clamps absent.

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Created: 2016-04-08 00:29:04 EDT (-0400) by Danny Newman (myxomop)
Last modified: 2019-09-26 13:29:46 EDT (-0400) by Image Sharer (image sharer)
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