Summary: Gymnopilus liquiritiae is a member of Arora''s Gymnopilus sapineus group. Distinguishing features of Gymnopilus liquiritiae according to Hesler(2) include a bald, striate, distinctly colored cap, orange to tawny flesh, yellow gills, lack of a veil, and caulocystidia in tufts. The description is derived from Hesler(2) except where noted.
Collections were examined from OR, ID, CA, FL, ME, MI, NC, NH, NM, NY, TN, VT, WY, and Sweden, (Hesler), and reported from BC (in Redhead(5)) and AB (Schalkwijk-Barendsen).
Cap: 2-8cm across, convex then flattening, sometimes somewhat umbonate, (according to Schalkwijk-Barendsen fitting into available space because of close proximity); fulvous, "ochraceous-buff", "ochraceous-tawny", "ochraceous orange", "zinc-orange", or "Kaiser brown", disc often "tawny", (according to Schalkwijk-Barendsen pale yellow orange at first, later orange brown); not viscid; bald or with minute, brown, waxy dots, margin becoming striate
Flesh: pale orange to tawny-yellow
Gills: adnate then adnexed, seceding, close or crowded, broad to medium broad; "ochraceous-buff" to "light orange yellow", finally "ochraceous orange" to "ochraceous tawny" to "zinc-orange", at times reddish-brown spotted; edges fimbriate [fringed], (Hesler), adnate-serrate, close, relatively broad, many subgills; "pale buff orange at first, then orange brown", becoming spotty, (Schalkwijk-Barendsen)
Stem: (1)3-7cm x (0.2)0.3-0.8(1)cm, often off-center, widening upward or widening downward, hollow; pallid or dingy orange, top whitish or yellowish scurfy; fibrillose to subglabrous [more or less bald]
Veil: absent
Odor: "mild, or slightly aromatic, fragrant, or of raw potatoes"
Microscopic spores: spores 7-8.5(10) x 4-5.5 microns, elliptic, verruculose [finely warty], "no germ pore, ferruginous in KOH, dextrinoid"; basidia 4-spored, (20)25-32 x 4-6 microns; pleurocystidia inconspicuous, 20-30 x 4-7 microns, "clavate, cylindric, or subventricose, capitate to non-capitate"; cheilocystidia 20-40 x 3-6 microns, "flask-shaped, capitate or non-capitate"; pileocystidia 32-54 x 3-6 microns, clavate to cylindric; caulocystidia often in tufts, 27-48(105) x 3-7 microns, filamentous or ventricose; yellow pigment, soluble in KOH, present in gill trama; clamp connections present
Spore deposit: "raw sienna" to "antique brown"
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