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Summary: distinguished by often pink-tinged, fibrillose cap that often darkens when old, pale pinkish to pinkish gray gills at first, the thick felty ring, bald stem, phenol odor when base of stem broken open, usually pale yellowish staining in base of stem, yellow staining of cap in KOH, and woodland habitat; synonyms include A. bivelatoides, A. hillii, A. macmurphyi, (all according to A.H. Smith), A. glabrus (Ammirati), and possibly A. subrufescentoides Murrill (Kerrigan(1) - the darkest form, "more commonly in the pacific northwest but only rarely in California", but Kerrigan(2) notes that the type and another authenticated collection have longer spores than typical A. hondensis); Agaricus hondensis is "a characteristic if not superabundant fungus of the Pacific North American temperate forests", (Kerrigan(2)), indicated for BC, CA in Smith(15), WA and OR by Isaacs, ID (Andrew Parker, pers. comm.), AB by Schalkwijk-Barendsen, CHEMICAL REACTIONS cap surface staining bright yellow in KOH, (Arora), bright yellow with 3% KOH, (Isaacs)
Cap: 6-15(20)cm convex becoming flat; whitish or with pale pinkish brown to pinkish gray to fawn-colored flattened fibrils or fine fibrillose scales (at least at center), the fibrils often darkening when old to brown, reddish brown, or reddish gray, but in one northern form darker brown from the beginning; dry, smooth, (Arora), 8-15cm broad, hemispheric becoming broadly convex then flat; pallid to buff, sometimes darker brown, especially when old, background whitish; dry, bald or appressed fibrillose-squamulose [fibrillose - fine-scaly] or subareolate [somewhat cracked like dried mud], (Kerrigan(1)), varies from cream to deep vinaceous brown (Kerrigan(2))
Flesh: thick; "white, unchanging or staining pale yellowish when bruised, then often slowly discoloring pinkish", flesh in extreme base of stem usually bruising pale yellowish, (Arora), up to 1.5cm thick; white, unchanging, in stem lustrous, white, unchanging or becoming somewhat yellow in lower part, (Kerrigan(1)), markedly solid (Trudell)
Gills: free at maturity, close; pale pinkish to pinkish gray becoming brown, then chocolate brown or darker, (Arora), free, close, up to 1cm broad; pinkish at first, becoming dull pinkish and finally dark blackish brown, (Kerrigan(1)), grayish pink, becoming purplish brown, (Lincoff), free, close to crowded, narrow; "pink to pale grayish lilac, becoming more or less deep reddish brown", (Ammirati), white in buttons, then pinkish, finally lilac-gray to reddish brown or chocolate brown, (Chariton), grayish to pale pinkish when young (Trudell)
Stem: 7-20cm x 1-2.5cm but with a thicker or more bulbous base, firm; "white or discoloring dingy pinkish or brownish in age or after handling"; smooth, naked, (Arora), 12-20cm x 1-1.5cm, 2-3cm wide in lower part, stuffed-hollow, "base fairly shallowly rooted even though often developing under deep litter"; white, unchanging; "smooth, or with some fibers subtending annulus", (Kerrigan(1)), usually with an abrupt bulbous base (Ammirati)
Veil: membranous, white, forming a thick, felt-like, superior ring on stem, ring skirt-like but often flaring outward instead of collapsing against stem, (Arora), veils forming a thick, pendant, subapical, white ring, rather stiff, flaring broadly, tending not to collapse until very old, smooth upper surface, (Kerrigan(1)), membranous, moderately thick, apical on stem, upper surface of ring white and striate, "lower surface typically with loose dark pink to grayish vinaceous cottony fibrillose patches, or merely loosely white-fibrillose", universal veil lacking, (Ammirati)
Odor: crushed flesh mild or faintly phenolic but usually distinctly phenolic in base of stem when crushed, (Arora), phenolic or often indistinct, usually strongly phenolic in base, (Kerrigan(1))
Microscopic spores: spores 4.5-6 x 3-4 microns, elliptic, smooth, (Arora), spores (3.4)4.7-5.7(6.0) x (3.0)3.3-3.5(5.3) microns, elliptic to elongate, dark brown, hilar appendix somewhat prominent, germ pore not evident; basidia 4-spored, 22-25 x 6 microns, cylindroclavate to clavate, sterigmata 3-4 microns long; cheilocystidia 10-15 x 10-15 microns, nearly spherical, or possibly also basidiole-like and about 17 x 7.5 microns, uncommon, gill margin primarily composed of narrow hyphae oriented parallel to margin, almost sterile, (Kerrigan(1)), spores (5.1)5.8-7.3(8.8) x 3.7-4.4 microns, broadly elliptic, slightly inequilateral in side view, smooth, thick-walled, without germ pore; pleurocystidia lacking, cheilocystidia 18.3-25.6 x 7.3-11.0 microns, sac-like to clavate, colorless to pale yellowish brown; clamp connections not seen, (Ammirati), spores of type 5.5-6.5(7) x 3.5-4(4.5) microns, but the large spores are unusual and the majority are 5.6-6 x 3.5 microns; cheilocystidia very scattered to clustered saccate, often difficult to locate because of their sporadic occurrence and because they often do not project beyond the basidia, (Smith(47))
Spore deposit: chocolate brown (Arora)
Habitat / Range
single or in groups, troops, or fairy rings in woods on ground, "particularly where there are thick accumulations of fallen twigs and other debris", (Arora), in arcs, subcespitose [more or less in tufts], gregarious, or single, under conifers in needle duff or under brush (Rubus, Holodiscus) in leaves, (Isaacs), gregarious in litter of Sequoia, Pinus (pine), Quercus (oak), rarely Cupressus (cypress) and other trees, usually in deep woods, (Kerrigan(1) for California), low elevation, conifer duff (Chariton), one of the relatively few Agaricus species found under redwood, in California also occasionally found with Cupressus macrocarpa (Monterey cypress) and C. abramsii (Santa Cruz cypress), but north of California occurs with other conifers and may occasionally be found under hardwoods, (Kerrigan(2))
Agaricus 'praeclaresquamosus' lacks the pinkish tints and markedly solid flesh of A. hondensis, and flesh in the extreme base of the stem stains a brighter yellow when cut or crushed, (Trudell), like A. campestris or A. bisporus somewhat, but A. hondensis has prominent ring, and unpleasant odor when flesh of stem base is crushed; A. crassistipus has flesh that turns orange to wine color with nitric acid or alpha naphthol, (bicolored flesh, first yellow then wine-colored), stem short for breadth of cap, massively club-shaped, ring recumbent never flaring, gills grayish then reddish brown; A. haemorrhoidarius stains red and has a pleasant odor; like A. silvicola if pallid, but A. silvicola has almond odor; A. californicus is smaller with gray-brown fibrils on inrolled cap
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
19/10/2019 10:28:53 AM
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