Ganoderma subresinosum

Ganoderma subresinosum (Murrill) C.J. Humphrey

Facesoffungi number: FoF03808

Basidiome annual, sessile (with distinctly contracted base), weakly laccate, woody. Pileus 16–20 × 11–13 cm, up to 4 cm thick at the base, sub-orbicular; upper surface dark brown (8F4), radially rugose, concentrically sulcate with irregularly ruptured crust overlying the context; margin blunt or wavy, yellow brown; lower surface brownish orange (6C4). Hymenophore up to 20 mm long, indistinctly stratose; pores initially greyish orange (5B3), bruising brownish orange (6C4), pores circular, 3–5 per mm. Context up to 2 cm thick, duplex, dry; lower layer, light orange (5A4), fibrous, composed of coarse loose fibrils; upper layer brownish orange (6C5), corky. Basidiospores (n = 25) (13.3–)13.9–15.3–16.5(–17.8) × (8.0–)9.2–10.2–11.1(–12.1) μm (Qm =1.5, Q = 1.3–1.9, with myxosporium). (11.6–)12.2–13.5–14.8(–16.3) × (6.3–)7.3–8.4–9.5(–10.4) μm (Qm =1.6, Q = 1.3–2.2, without myxosporium), ellipsoid to ellongate, orange (6A6), pale orange (6A3) to greyish orange (5B4), with a brown eusporium bearing fine, short, and distinct echinulae, overlaid by a hyaline myxosporium. Pileipellis a hymeniderm, light orange (5A4), clavate like cells, dextrinoid. Context dimitic; generative hyphae not observed; skeletal hyphae (n = 25) (2.2–3.1–4.0) μm in width, thick-walled, nearly solid, sometimes branched, orange white (5A2); binding hyphae (n = 20) (1.4–2.3–3.3) μm in width, thick-walled, branched, nearly solid, brownish-orange (6C4). (Fig 1)

Habitat: On a decaying wood log, accompanied in humus-rich soil with over heavily rotted litter on the ground.

Specimens examined: LAOS, Savannakhet Province, Dong Phou Vieng, mixed deciduous forest, 16°23′N–105°59′E, elev. 283 m, 21 June 2017, P. Phensinthgthem (GACP18011907, GACP18011908). CHINA, Hainan Province, Wuzhishan Mountain, Coniferous rainforest, 18°53′N–109°38′E, elev. 1240 m, 16 August 2014, T.C. Wen (GACP14081663, GACP14081690).

Notes – Ganoderma theaecola was introduced from Guangxi, China as a laccate Ganoderma species (Zhao et al. 1984). In Index Fungorum, as an editorial comment, it is mentioned that the orthography of this specific epithet is uncertain (www.indexfungorum.org, accessed 22 December 2018). Since the type specimens located in herbarium of Chinese Academy of Sciences, is scanty and difficult to observe, we have loaned a reference specimen from the herbarium of Guizhou Agricultural Sciences. Basidiospore size is mentioned as (7–9 × 5.2–6.2) μm (Zhao et al. 1984), (6–9 × 5–6) μm (Wu & Dai 2005) and (8.4–10.1 × 6.6–7.6) μm (This study). Furthermore, there is no molecular data available for this species in GenBank. (from Hapuarachchi et al. 2019)