Name: Mycena amicta
Author: (Fr.) Quél.
Misspellings: Mycena amicta (Fr.) Quél (bluing Mycena)
The synonymy given for this species is taken from Kuhner (1938). As frequently happens in the case of a variable species, M. amicta has received many names. A second study of Murrill’s type of M. caesiialba proved the type collection to be a mixture of two species. The only well-preserved specimen is identical in every respect with the large lignicolous form of M. amicta. For additional comments on M. caesiialba see page 474.
The fine pubescence of the stipe, the thick tenacious separable pellicle of. the pileus, the close gills, ellipsoid spores, and narrow cheilocystidia form a group of characters which enable one to identify specimens that have lost all traces of the bluish or greenish colors. When the plants are growing on conifer logs and stumps the fruiting bodies are often quite large and highly colored, but there appear to be no other characters correlated with these that would serve to distinguish a taxonomic unit.
-North American Species Of Mycena, Page 63
Ian Gibson’s MatchMaker descriptions are based on the original descriptions and have a +/- standard format:
LATIN NAME Mycena amicta (Fr.) Quel. Champ. Jura et Vosges p. 243. 1872; Mycena vestita Velen.
ENGLISH NAME coldfoot bonnet
NOTES Section Cyanescentes (Smith), which is equivalent in species to Section Amictae (Maas Geesteranus). Mycena amicta is characterized by bluish or greenish color, and even when it has lost that color it identifiable thick separable cap skin, close gills, downy stem, elliptic spores and narrow cheilocystidia. The disc area is often 2-toned, with the more deeply colored disc area changing fairly abruptly to the lighter marginal area. When growing on conifer logs, the fruiting body is large and brightly colored. The description is derived from Smith except where noted. It is not uncommon in the Pacific Northwest, occurring at least in BC, WA, OR, CA, NY, and ON (Smith). Breitenbach(3) give the distribution North America, Europe, Asia, and North Africa.
CAP 0.5-2.5cm across, obtusely conic, becoming conic – bell-shaped with an obtuse umbo, margin appressed against stem by narrow band, ‘“olivaceous black (1)” on disc and “light mineral gray” on the margin, often with strong aeruginous to bluish tints pervading through the olive gray, disc in large specimens “dark orient blue” and the margin “light glaucous blue”, soon fading to livid gray’, when old all forms becoming ‘“wood brown” to “avellaneous” (pale grayish brown) on the disc and “tilleul buff” (pallid) on the margin, in some the disc becoming tinged vinaceous gray’, surface pruinose becoming polished then granulose, pellicle [cap skin] thick, tenacious, separable, (Smith), ‘olivaceous black on the disc and grey on the margin with strong bluish tints showing through, soon fading to livid gray [sic] then to brown tones’, (Miller, A.)
FLESH thin, cartilaginous; pallid
GILLS narrowly adnate to free, close (20-30 reaching stem), narrow, 0.15-0.25cm broad; whitish becoming pale avellaneous
STEM 3-8cm x 0.1-2.5cm, ‘equal, hollow, fairly fragile’, ‘pallid to sordid brownish gray (sometimes bright blue when young), hoary from a dense pruinose-pubescent covering, color beneath the pubescence dark greenish to bluish gray and soon fading to brownish gray’; base somewhat strigose [hairy] with blue or white strands of mycelium
HABITAT scattered to densely gregarious on conifer needles or debris or rotten conifer wood, (Smith), often on or near well-rotted conifer wood in the Pacific Northwest, elsewhere on hardwood, (Trudell), summer, fall, (Buczacki)
SPORE DEPOSIT whitish cream (Breitenbach quoting literature)
MICROSCOPIC spores 7-9(10) x 4-5 microns, narrowly elliptic, smooth, amyloid; basidia 4-spored; pleurocystidia absent or not differentiated, cheilocystidia abundant, narrowly fusoid [spindle-shaped] with only slightly tapered necks and obtuse to somewhat acute tips, becoming subfilamentous [somewhat filamentous] when old, 28-44 × 5-7 microns
SIMILAR Mycena subcaerulea is also blue but grows near or on hardwood debris east of the Great Plains and has wider spores 7-8 × 6-8 microns, (Smith).
SOURCES Smith(1) (colors in double quotation marks from Ridgway(1)), Miller, A.(1), Courtecuisse(1), Breitenbach(3), Maas Geesteranus(1), Trudell(4), Buczacki(1)
FAMILY Mycenaceae of Order Agaricales
Created: 2007-05-25 02:08:13 BST (+0100) by Douglas Smith (douglas)
Last modified: 2019-01-26 17:36:21 GMT (+0000) by Alan Rockefeller (Alan Rockefeller)
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