Amauroderma schomburgkii (Mont. & Berk.) Torrend, Brotéria, sér. bot.
Index Fungorumnumber: xxx; Facesoffungi number: FoF05665
Basidiome annual to perennial, stipitate, corky, becoming hard corky to woody hard when dry. Pileus 3.0–4.5 cm, up to 1 cm thick at the base, suborbicular; upper surface when young pale yellow (4A3) to light brown (6D6), becoming brownish orange (6C8), alternating light brown (6D6) to brownish orange (6C8) concentric zones, weakly laccate to non laccate; lower surface usually pale orange; margin 2 mm thick, concolorous with pileus, slightly wavy. Hymenophore up to 12 mm long, indistinctly stratose; pores initially brownish orange (5C4), bruising brown (6E8), pores sub-circular or isodiametric, 4-6 per mm. Context up to 6 mm thick, duplex, dry; upper layer light brown (5D6), fibrous, composed of coarse loose fibrils, brown (6E8), corky; lower layer light brown (5A5), corky. Stipe subcylindrical to cylindrical, lateral to horizontally lateral or eccentric, dark brown (6F6), 2.5 × 4, 0.5 cm at the base. Basidiospores (n = 30) (7.5)8.6–9.8–11.0(12.3) × (5.4)6.6–7.9–9.3(10.8) μm (Qm = 1.3, Q = 1.1–1.7, with myxosporium) (6.1)6.9–7.9–9.0(10.0) × (4.4)5.3–6.4–7.5(8.5) μm (Qm = 1.3, Q = 1.1–1.7, without myxosporium), light brown (6D6), with a dark brown (6F4) eusporium bearing thick echinulae, overlaid by a hyaline myxosporium, sub globose to broadly. Pileipellis a hymeniderm, brownish-orange (5C4), clavate like cells, dextrinoid. Context dimitic; generative hyphae not observed; binding hyphae (n = 25) (1.2–2.3–3.1) μm in width, branched, with clamp-connections, light brown (6D6) to brown (6E6); skeletal hyphae (n = 25) (1.3–2.6–3.7) μm in width, thick-walled, sometimes branched, brown (6E6). (Fig 1)
Habitat: Rotten wood, on the soil near in humus-rich soil with over heavily rotted litter on the ground, growing up from soil.
Specimens examined: LAOS, Xiengkhouang Province, Phoukoud District, Yai village, Evergreen forest, 19 58′N–103 00′E, elev. 1120 m, 27 July 2016, P. Phengsintham (GACP16072703, GACP16072833). CHINA, Hainan Province, Jiangfengling Mountain, Coniferous rainforest, 18°44′N–108°51′E, elev. 550 m, 25 September 2017, T.C Wen (GACP14080901, GACP14080905).
Notes: Amauroderma schomburgkii is the type species of Amauroderma. The reddish brown pileus, brown context, small pores and the globose basidiospores characterize this species and A. sprucei is separated only by its white to pale cream context (Ryvarden 2004a). Our collections agree well with the descriptions provided by Furtadoa (1981). Basidiomes of Amauroderma show a wide variation in dimension, texture, shape and color, which has caused the description of many taxa having same microstructure as A. schomburgkii (Furtadoa 1981). This is the most common taxon of Amauroderma in Neotropical collections and known from southern Brazil to Cuba, Puerto Rico, Jamaica (Ryvarden 2004a) and China (Zhao 1989, Zhao & Zhang 2000). We report A. schomburgkii from Laos as a new record based on morphological evidence. (from Hapuarachchi et al. 2019)