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Species Information
Summary: Features include growth on old fabric or on wood, small size, a kidney-shaped, dry, brown cap, light purple brown to pinkish cinnamon gills that are white-edged and stain dark brown with handling, an off-center, curved stem that is brown, furry, and narrows toward base, and a purple brown to dark brown spore deposit. The description derived from Redhead(18) except where noted.
Deconica horizontalis was examined from BC, WA, OR, and CA, (Redhead). It was examined also from United Kingdom, France, South Africa, (Sime).
Gills: "adnexed to adnate and sometimes with short, decurrent teeth", close to subdistant, 3 or more tiers of subgills, gills narrow becoming moderately broad; "cinnamon" to "pinkish cinnamon" becoming ''light brown'' to ''moderate brown'' or ''grayish brown'', staining ''dark brown'' on handling, edges whitish; edges entire
Stem: 0.5-1.5cm x 0.1-0.5cm, eccentric [off-center] but not lateral, usually distinctly curved and tapered toward base; near "mikado brown" to "sayal brown" or ''dark brown'' to ''brownish black''; "often with a ''light brown'' to whitish pruinose to tomentose vestiture"
Odor: faintly aromatic or not distinctive
Taste: not distinctive
Microscopic spores: spores 6-7(7.5) x 3.5-4.5 x 4.5-5 microns, 8.5 x 6 microns on ?2-spored basidia, oval and only slightly compressed, smooth, relatively thin-walled (<0.5 micron), with apical germ pore; basidia (?2)4-spored, 17-22 x 5.5-6.5 microns, "somewhat urniform, clamped, often appearing to be subtended by a small basal cell", colorless; cheilocystidia forming a sterile margin, 15-26 x 4.5-5.5 microns, "lageniform to fusoid-ventricose with a slightly undulate neck and obtuse narrow apex, often with a prominently swollen base", often capped by a colorless resinous drop, (Redhead(18)), spores 6.4-7.2(8) x 4-5 microns, in side view elliptic to subamygdaliform [somewhat almond-shaped], with an apical germ pore, in mass brown-vinaceous, wall up to 1.0 micron thick, smooth; basidia 4-spored, 17-24 x 5-7 microns, cylindric to clavate, often constricted subapically, thin-walled, colorless; pleurocystidia numerous to scattered, 17-30(35) x 4-5 microns, "always embedded but with an emergent neck", easy to overlook, "similar in shape to cheilocystidia, often with an apical droplet", cheilocystidia numerous, 15-30(33) x 4-5 microns, "clavate, lageniform to ventricose-rostrate", neck often wavy, apex narrowing and thin-walled, often with a membrane-bound hydrophobic golden droplet up to 7 microns diameter, (Sime), clamp connections present (Watling)
Spore deposit: purple brown to dark brown (Redhead(18)), mid-brown (Buczacki)
Habitat / Range
on rotting fabrics and woody litter: old fabrics or old carpets, seat covers of abandoned cars, mattresses, rotting blue jeans, or on wood, (Redhead(18)), single or in small groups, +/- tufted, on wood, often on cut faces of stacked logs, also on other organic matter such as woollen carpet, rope; spring to winter, (Buczacki)
Redhead(18) (as Melanotus textilis, colors in double quotation marks from Ridgway(1), in single quotation marks from Kelly(1)), Sime(1) (as Melanotus horizontalis), Redhead(6) (as Melanotus textilis), Watling(3) (as Melanotus textilis and Melanotus horizontalis), Buczacki(1)* (as Melanotus horizontalis) References for the fungi
