Gomphidius albipes Y. Li & L. L. Qi, 2017

Qi, Liangliang, Fu, Yongping, Lang, Ning, Bai, Xianjin & Li, Yu, 2017, A new species of Gomphidius from Northeast China, Phytotaxa 316 (2), pp. 181-188 : 184-186

Gomphidius albipes Y. Li & L. L. Qi , sp. nov. (Figs. 2,3)

Fungal Names FN 570239

Diagnosis:— Gomphidius albipes differs from Gomphidius maculatus by the smooth stipe lacking squamules. Etymology:— “ albipes ” refers to the white apex of the stipe.

Type:— CHINA. Heilongjiang Province: Tahe County, 359 masl, 17 August 2015, (HMJAG34328, holotype).

Description:— Pileus 2–5 cm in diam., subhemispherical to applanate, margin incurved, slightly upturned with age, glabrous, glutinous, center salmon (6B6) to salmon-buff (6A6), margin seashell pink (6A3) to orange (6A5) or white when young, dark orange (7D6) or dark reddish orange (8D8) with age. Lamellae subdistant to distant, thick, edges bluntly rounded, subdecurrent to decurrent, dichotomously branched and often transversely venose or rugulose towards margin, 2–7 mm wide, lamellae faces pale gray, margin white, unchanged color when cut. Flesh white or light orange, color unchanging when exposed. Stipe 5–8 cm long, 0.6–1 cm wide, central, solid, tapering towards base, apex white, color unchanging when handled, without scattered squamules or scales, mid stipe white or pale orange, changing to light orange when handled, not discoloring with age, base usually bright yellow, changing to brownish or yellow brown after handling, mycelium on the base yellowish. Context of stipe white at the apex and bright yellow at the base. Annulus absent.

Basidiospores (12.0–)16.0–20.5 (–22.5) × (6–) 6.5–8.5 (–9) μm, n = 30, (Q = 2.4, Q m = 2.4 ± 2.21), ellipsoid to long ellipsoid, subfusiform, thick-walled, smooth, brown to pale yellow-brown in KOH, inamyloid wall in Melzer’s reagent. Basidia clavate or subclavate, 60–80 × 11–14.5 μm, 4-sterigmate, thin-walled, hyaline in KOH, light yellow in Melzer’s reagent, inamyloid. Pleuro- and cheilocystidia similar, scattered, ampulliform, occasionally clavate or subclavate, 85–190 × 15–24μm, thin-walled, pinkish to light brown in KOH, often with brown to light orange encrustations, parts of encrustations dissolved in KOH, encrustations buff-yellow in Melzer’s reagent, non-amyloid. Caulocystidia rare, scattered at the apex of the stipe, clavate or sub-clavate, 32.5–68.5 × 5–12 μm, with yellow-brown encrustations in KOH, inamyloid. Pileipellis an ixocutis of loosely interwoven, branched, gelatinised hyphae, surface of hyphae covered with encrustations, thin-walled, 5–10μm. Lamellar trama 4.5–9μm, interwoven, thin-walled, colorless to light orange in KOH, pale lemon yellow in Melzer’s reagent, inamyloid. Stipitipellis composed of 12–20 μm, hyphae colorless in KOH, light yellow in Melzer’s reagent on the apex, light yellow in KOH, yellow-orange in Melzer’s reagent on the surface of base, Stipe trama colorless in KOH, light yellow in Melzer’s reagent, inamyloid. Clamp connections rare, only present on the basal hyphae of the stipe.

Habit, habitat and distribution:—Solitary to scattered in soil of coniferous forests under Larix gmelinii , found in the Greater Khingan Mountains.

Additional specimens examined:— CHINA. Heilongjiang Province: Huma County, Erhaofangzi Village , 359 masl, 51°34′ N, 126°32′ E, 17 August 2015, Liangliang Qi & Mengle Xie 4597 ( HMJAU34326 !) ; Tahe County, Qixiashan Botanical Garden , 307 masl, 52° 20′N, 124°41′ E, Liangliang Qi & Mengle Xie 4660 ( HMJAU34327 !) ; Inner Mongolia Autonomous Region: Genhe City , Deerbuer County, 806 masl, 50°59′ N, 121°02′ E. Liangliang Qi & Mengle Xie 5471 ( HMJAU34333 !). The specimens were collected from different locations in the Greater Khingan Mountains , northeastern China , where Larix gmelinii is abundant .