|Major Groups > Gilled Mushrooms > Pale-Spored > Collybioid > Connopus acervatus|
by Michael Kuo
Defining features for this distinctive mushroom, which was known as "Gymnopus acervatus" or "Collybia acervata" until very recently, include the densely clustered growth on the wood of conifers; the convex (not conical) reddish brown caps that fade to pinkish buff; and the reddish to reddish brown stem that is bald except for the slightly fuzzy base. Older specimens demonstrate a marked contrast between the pale caps and the reddish stems.
A recent study by Hughes and collaborators (2010) used two genes (ITS and LSU) to examine many collybioid mushrooms; collections of "Gymnopus acervatus" grouped separately from other species of Gymnopus and from species of Rhodocollybia. Thus, the authors proposed a new genus name, Connopus, to accommodate Gymnopus acervatus. The authors' data found potential support for the idea that the western North American version of Connopus acervatus "might be a distinct species" (p. 1476).
Ecology: Saprobic; growing in dense clusters on conifer stumps (and sometimes from buried conifer wood, appearing terrestrial); summer and fall, or in winter in Texas and California; fairly widely distributed in North America but apparently absent or rare in southwestern and southeastern areas.
Cap: 1-5 cm; convex, becoming planoconvex; smooth; reddish brown and moist when young and fresh, but soon fading to brownish or pinkish buff (often passing through a two-toned stage).
Gills: Attached to the stem broadly or narrowly; close or crowded; whitish when young, developing pink tones.
Stem: 2-12 cm long; up to about 6 mm thick; more or less equal; dry; hollow; smooth except for whitish fuzz near the base; reddish brown to purplish brown; not fading as quickly as the cap.
Flesh: Thin; whitish.
Odor and Taste: Odor not distinctive; taste mild or bitter.
Spore Print: White.
Microscopic Features: Spores: 5.5-7 x 2.5-3 µ; smooth; elliptical or nearly cylindric; inamyloid. Pleurocystidia absent. Cheilocystidia up to about 40 µ long; variously shaped; often with protrusions or lobes--or, in western North American collections, more or less cylindric with subclavate or merely rounded apices. Pileipellis a tangle of cylindric, branching (but not diverticulate or coralloid) hyphae 2-5 µ wide.
Collybia acervata and Gymnopus acervatus are synonyms.
REFERENCES: (Fries, 1821) K. W. Hughes, Mather & R. H. Petersen, 2010. (Saccardo, 1887; Kauffman, 1918; Smith, Smith & Weber, 1979; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Barron, 1999; Halling, 2004; McNeil, 2006; Miller & Miller, 2006; Trudell & Ammirati, 2009; Hughes et al., 2010.) Herb. DBG 18199.
Further Online Information:
Cite this page as:
Kuo, M. (2013, January). Connopus acervatus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/connopus_acervatus.html