Amauroderma aurantiacum (Torrend) Gibertoni & Bernicchia, Mycotaxon, 2008

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 : 112-113

Amauroderma aurantiacum (Torrend) Gibertoni & Bernicchia, Mycotaxon 104: 322 (2008). Figs. 7 a–b , 8 a

≡ Ganoderma aurantiacum Torrend, Iconographia mycologica 21: 1007 (1932)

Description:— Furtado (1981) and Ryvarden (2004) as A. macrosporum J.S. Furtado (1981: 59) .

Substrate:—Growing out of the ground associated with roots.

Distribution:— Brazil and Venezuela. In Brazil this species has been recorded from Amazonia, Atlantic Forest and the Cerrado ( Ryvarden & Iturriaga 2001, Ryvarden 2004, as A. macrosporum, Gibertoni et al. 2008 , Campacci & Gugliotta 2009, Gugliota et al. 2015).

Specimens examined:— BRAZIL. Mato Grosso: Chapada dos Guimarães, Parque Nacional da Chapada dos Guimarães, Sítio Vale do Rio Claro , 15 May 2011, Costa-Rezende DHCR30 ( FLOR 52167 ) ; 12 January 2014, Pereira-Silva LPS02 ( FLOR 52197 ) ; Pereira-Silva LPS03 ( FLOR 52203 ) ; Pereira-Silva LPS04 ( FLOR 52202 ) ; Pereira-Silva LPS08 ( FLOR 52199 ) ; Pereira-Silva LPS12 ( FLOR 52200 ) ; Pereira-Silva LPS14 ( FLOR 52201 ) ; Pereira-Silva LPS17 ( FLOR 52204 ) ; Pereira-Silva LPS25 ( FLOR 52198 ) ; Sitio Véu de Noiva , 19 Janaury 2012, Alves-Silva LPS77 ( FLOR 52206 ) .

Comments:—The thick and soft pileus when fresh, with orange to reddish brown pilear surface, large pores (1–2/ mm) and globose to subglobose [(13) 14–17 (18) × 13–17 (18) μm], yellow, and thick-walled spores, with conspicuous endosporic sub-reticulate ornamentation, similar to those described by Ryvarden (2004) and Furtado (1981), are distinctive for this species. Amauroderma calcigenum also presents a reddish brown pilear surface, soft pileus and big basidiospores, nonetheless the spores are ellipsoid with columnar ornamentation.

The presence of trichodermal structures in the pilear surface was not reported by Furtado (1981) and Ryvarden (2004), probably due to the specimens revised being too old, which may preclude the observation of this feature, as observed by us. However, we have observed trichodermal structures in well-preserved specimens, composed of loose generative hyphae, up to 120 μm long, with or without clamps and adventitious septa. These generative hyphae are found projecting from a layer formed by moderately thick-walled generative hyphae, parallel to the context hyphae.

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.