Polyporales » Ganodermataceae » Ganoderma

Ganoderma flexipes

Ganoderma flexipes  Pat., Bull. Soc. mycol. Fr

Index fungorum number:xxx; Facesoffungi number: FoF05651

Basidiome annual, stipitate, laccate, corky, becoming hard corky to woody hard when dry. Pileus 2.5–3.5 × 1.0–2.0 cm, up to 0.5 cm thick at the base, flabelliform, rotund, upper surface; reddish-brown (8E8), concentrically sulcate zones with turberculate bumps and ridges and rivulosedepressions, with irregularly ruptured crust overlying the pellis. Margin; soft, yellowish brown (5E8), lower surface; light brown (7D5). Hymenophore up to 10 mm long, indistinctly stratose; pores initially greyish brown (7D3), bruising brown (8E8). Pores circular or sub-circular or isodiametric, 3–4 per mm. Context up to 8 mm thick, triplex, dry; lower layer reddish brown (8E8), fibrous, composed of coarse loose fibrils; upper layer dark brown (8F8), corky to woody. Stipe eccentric, dorsally lateral to nearly dorsal, sub-cylindrical, dark brown (8F8), 4.0 × 7.0 cm, 0.4 cm thick at the base. Basidiospores (n = 25) (8.3–)9.1–9.8–10.5(11.1–) × (–6.5)7.3–6.1–9.2(–10.5) μm (Qm = 1.4, Q = 0.9–2.1 with myxosporium). (6.5–)7.3–8.3–9.2(–10.5) × (4.1–)4.4–4.9–5.4(–5.9) μm (Qm = 1.4, Q = 0.9–2.9, without myxosporium), ellipsoid, light orange (5A5), brownish orange (6C8) to light brown (5A5), with a brown eusporium bearing fine, short and distinct echinulae, overlaid by a hyaline myxosporium. Pileipellis a hymeniderm, brownish orange (6C8), clavate like cells, dextrinoid. Context trimitic; generative hyphae (n = 30) (1.5–)1.2–1.8–2.6(–3.9) μm in width, hyaline, thin-walled without clamp connections; skeletal hyphae (n = 30) (3.1–)1.5–4.4–5.5(–6.8) μm in width, thick-walled, nearly solid, sometimes branched, greyish brown (5B5) to brownish orange (6C8); binding hyphae (n = 30) (2.4–)3.2–4.1–4.9(–5.4) μm in width, thick-walled, branched, nearly solid, light orange (5A5) to brownish orange (6C8). (Fig. 1)

Habitat:  Growing near hardwood roots or rotten woods, in dry dipterocarp forest, coniferous rain forest and in upper mixed deciduous forest, growing up from soil.


Specimens examined: LAOS, Savvanakhet Province, Phin District, Dong Phou Vieng Protected Area, 16°23′N–105°59′E, elev. 283 m, mixed deciduous forest, 27 June 2017, P. Phengsintham (GACP17062724), Huaphanh Province, Samneua District, Nasala Village, 20°22′N-103°98′E, elev. 1346 m, Coniferous rain forest, 30 July 2017, P. Phengsintham (GACP17073037). VIETNAM, Lam Dong Province, Bidoup Nui Ba National Park, 12°26′N–108°30′E, elev. 2050 m, coniferous rain forest, 19 October 2017, T.C Wen (GACP17101903, GACP17101910, GACP17102101, GACP17102301).

Notes: Ganoderma flexipes was introduced by Patouillard (1907) from Vietnam and has since been recorded from China, India, Nepal, Pakistan (Steyaert 1972, Zhao & Zhang 2000, Wang & Wu 2007). This species can easily be recognized by its small reddish brown pileus, long and thin stipe, reddish brown to dark brown context, and ellipsoid or ovoid basidiospores. Our collections fall within the range (8–13 × 5.5–8) μm, measured by Steyaert (1972) and fit that of the lectotype (9–11 × 6–7.5) μm, measured by Ryvarden (1983) for G. flexipes. We report G. flexipes from Laos as a new record. (from Hapuarachchi et al. 2019)