Amauroderma schomburgkii (Mont. & Berk.) Torrend, Brotéria, 1920

Costa-Rezende, Diogo Henrique, Gugliotta, Adriana De Mello, Góes-Neto, Aristóteles, Reck, Mateus Arduvino, Robledo, Gerardo L. & Drechsler-Santos, Elisandro Ricardo, 2016, Amauroderma calcitum sp. nov. and notes on taxonomy and distribution of Amauroderma species (Ganodermataceae), Phytotaxa 244 (2), pp. 101-124 : 116

Amauroderma schomburgkii (Mont. & Berk.) Torrend, Brotéria , sér. bot. 18: 140 (1920). Figs. 7 h , 8 f

≡ Polyporus schomburgkii Mont. & Berk., London Journal of Botany 3: 331 (1844)

Description:— Furtado (1981) and Ryvarden (2004).

Substrate:—Growing out of soil but associated with roots.

Distribution:—The species seems to be the most common Amauroderma in the neotropics, occurring from South Brazil to Central America. In Brazil, it has been recorded from the Amazon, Atlantic Forest and Cerrado ( Furtado 1981, Ryvarden 2004, Campacci & Gugliotta 2009, Gugliotta et al. 2015).

Specimens examined:— BRAZIL. Mato Grosso: Chapada dos Guimarães, Parque Nacional da Chapada dos Guimarães, Sítio Véu da Noiva , 10 March 2013, Alves-Silva GAS393 ( FLOR 52176 ) ; 10 March 2013, Alves-Silva GAS401 ( FLOR 52175 )

Comments:—This species is recognized by its brown context with dark bands, pileipellis as a cortex, small pores (5–7/mm) and globose to sub-globose (rarely broadly ellipsoid) basidiospores [(8) 9–12 × (7) 9–11 μm]. Amauroderma exile and A. sprucei also have small pores and similarly shaped basidiospores. However, A. exile has a shiny, reddish brown and flexible pileus, distinct from A. schomburgkii , which usually presents a dull and hard basidiomata. Amauroderma sprucei is easily distinguished by its whitish context, vivid orange pore surface in some specimens, dextrinoid skeletal hyphae and a pileipellis as a crust.

Corner (1983) studied some specimens that he called A. schomburgkii A and A. schomburgkii B, with a distinct distribution in Brazil (the A in Amazonia, the B in Atlantic rain forest), but both had subglobose basidiospores (9–11.5 x 8–10.5 μm), different to the information given by Furtado (1981), Ryvarden (2004) and Gomes-Silva et al. (2015), in which the shape is described as globose with a variation in the diameter (between 7–11 μm, in general). As we have obtained the Q = 1.00–1.12 (1.20), ave-Q = 1.09, we describe the shape as globose to subglobose (rarely broadly ellipsoid).

Figures

FIGURE 7. Macroscopic view of basidiomata of Amauroderma species. a, b A. aurantiacum: a—section of the basidioma (FLOR 52198); b—pilear surface in detail (FLOR 52198). c—general view of A. brasiliense (FLOR 50932). d, e—A. omphalodes (FLOR 52224). d— pilear surface in detail; e—section of basidioma. f,g—A. praetervisum (FLOR 52209).f—pilear surface in detail; g—section of basidioma. h—general view of A. schomburgkii (FLOR 52176). i—general view of A. sprucei (FLOR 52184). Scale bar: 1 cm. Photos by: D.H. Costa-Rezende.

FIGURE 8. Spores of Amauroderma species from the Cerrado. a—A. aurantiacum (FLOR 52199). b—A. brasiliense (FLOR 50932). c— A. calcitum (FLOR52230, holotype) d—A. omphalodes (FLOR 52221). e—A. praetervisum (FLOR 52208). f—A. schomburgkii (FLOR 52176). g—A. sprucei (FLOR 52184). Scale bar: 5 μm. Photos by: D.H. Costa-Rezende.