Amauroderma preussii (Henn.) Steyaert.
Index Fungorum number:xxx; Facesoffungi number: FoF 05185.
Basidiome annual, corky, with distinctly contracted base at the center, becoming hard corky to woody hard when dry. Pileus single, 8–12 cm, up to 1 cm thick at the base, orbicular; upper 127 surface brown (6E4) to dark brown (6E5) alternating colour zones, near to margin, weakly laccate to non laccate, concentrically undulate, radially rugose; margin grey (6F1), wavy, inflexed; lower surface usually brown (6D7). Hymenophore up to 10 mm long, indistinctly stratose; pores initially brownish orange (5C4), bruising brown (6E8), pores circular or isodiametric, 2–4 per mm. Context 1 cm thick, triplex, not completely homogeneous in color; lower layer whitish-yellow (4A2) to yellow (4A3), corky; middle layer whitish-yellow (4A2) to yellow (4A3); fibrous/pithy, composed of coarse loose fibrils; upper layer yellowish-brown (6B3), woody. Basidiospores (n = 25) (8.5)9.0–9.9–10.8(12.1) × (6.7)7.6–8.5–9.5(10.5) µm (Qm = 1.1, Q = 0.9–1.4, with myxosporium). (n = 25) (7.5)7.9–8.6–9.4(10.1) × (4.9)6.2–7.3–8.3(9.9) µm (Qm = 1.1, Q = 0.8–1.6, without myxosporium), subglobose, bitunicate, with a dark brown (6D8), eusporium bearing echinulae, overlaid by a hyaline myxosporium. Pileipellis a hymeniderm, pale yellow (4A3), streaks near the cutis, a closely-packed palisade, whitish-yellow (4A2), clavate terminal elements. Context trimitic; generative hyphae (n = 30) (0.3–0.9–1.6) µm in width, colorless, thin-walled; skeletal hyphae (n = 30) (1.9–2.4–3.1) µm in width, thick-walled, sometimes branched brown (6E4) to greyish brown (6E3); binding hyphae (n = 30) (0.4–1.4–2.3) µm in width, branched, with clamp-connections, brown (6E4) to greyish brown (6E3), frequently branched at apex, intertwined with the skeletal hyphae. Macrochemical reactions — KOH reaction positive, yellow. Schäffer’s reaction positive, reddish-orange on dry specimen.
Habitat: Rotten conifer wood, on the soil near humus-rich soil with over heavily rotted litter on the ground, growing up from soil.
Material examined: Laos, Xiengkhouang Province, Phoukoud District, Yai village, evergreen forest, 19°58′N-103° 00′E, elev. 1120 m, collection date 27 July 2016, collector P. Phengsintham (GACP16072703, GACP16072833). China, Hainan Province, Jiangfengling Mountain, Coniferous rainforest, 18°44′N-108°51′E, elev. 550 m, collection date 21 October 2015, collector X.L Wu (GACP WXL15100201 ).
Notes: Amauroderma preussii was introduced as Ganoderma pressuii by Hennings (1891) from Cameroon. Steyaert (1972) transferred this species to Amauroderma (as A. pressuii). This species is characterized by sub-circular to circular, concentrically undulate pileus with darker concentric shades and spherical basidiospores (Steyaert 1972). Macroscopically, A. preussii is very difficult to distinguish from A. oblongisporum and the crust of the pileus of this species is thicker than in A. preussii and it is smoother in dry condition (Ryvarden & Johansen 1980). Furthermore, the pileus of this species is similar to A. wuzshishanense, however the latter has deep funnel-shaped pileus and larger spores (Wu & Dai 2005). This species has been recorded previously from African countries as a wood decaying species (Steyaert 1972, Ryvarden & Johansen 1980). It was recorded from various parts of China as a wood inhabiting polypore species (Bi et al. 1993, Wu & Dai 2005, Dai et al. 2011). Our collections from Laos agree well with description provided by the Ryvarden & Johansen (1980), Bi et al. (1993), Wu & Dai (2005) even though we were unable to obtain the DNA. Furthermore, there is not any sequence data available for A. preussii in GenBank ( from Hapuarachhi et al. 2018)
Fig. 1 Amauroderma preussi (GACP16072703). a Upper surface. b Lower surface. c Pores in the lower surface (5×). d Cut surface. e–j Spores (100×). k Skeletal hyphae (100×). l Generative hyphae (100×). m Binding hyphae (100×). Scale bars: e–j = 10 μm, k–m = 5 μm.
Hapuarachhi K. K., Karunarathna S. C., Phengsintham P., Kakumyan P., Hyde K. D. & Wen T. C. 2018–Amauroderma (Ganodermataceae, Polyporales)–bioactive compounds, beneficial properties and two new records from Laos. Asian Journal of Mycology, 1(1), 121-136.
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