Amauroderma praetervisum (Pat.) 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 : 115-116

Amauroderma praetervisum (Pat.) Torrend, Brotéria , sér. bot. 18: 131 (1920). Figs. 7 f–g , 8 e

≡ Ganoderma praetervisum Pat. , Bulletin de la Société Mycologique de France 5: 78 (1889)

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

Substrate:—Out of soil but associated with roots.

Distribution:— Brazil to Mexico. In Brazil this species has been recorded from Amazonia, Atlantic Forest, Caatinga and Cerrado ( Furtado 1981, Ryvarden 2004, Campacci & Gugliotta 2009, Abrahão et al. 2012, Gugliotta et al. 2015).

Specimens examined:— BRAZIL. Mato Grosso: Chapada dos Guimarães, Parque Nacional da Chapada dos Guimarães, Sítio Vale do Rio Claro , 12 January 2014, Pereira-Silva LPS013 ( FLOR 55263 ) ; 12 January 2014, Pereira-Silva LPS066 ( FLOR 52209 ) ; 12 January 2014, Pereira-Silva LPS067 ( FLOR 52208 ) ; 12 January 2014, Pereira-Silva LPS068 ( FLOR 52207 ) .

Comments:—The pale context with two black bands and a thin dark cuticle, small pores (4–5/mm) and a distinct core in the stipe, which is paler and softer than the outside layer, characterize the species macroscopically. Microscopically, it is recognized by the combination of a crust composed of some free hyphae on the pilear surface, trama of tubes having variable dextrinoid skeletal hyphae and large, subglobose to broadly ellipsoid spores, (11.5) 12–13.5 (14) × 10–12 (13) μm.

Regarding the pale context, consistency of pileus and pore size, A. omphalodes and A. sprucei could be morphologically related. Amauroderma omphalodes was treated above and A. sprucei has a whitish context and smaller basidiospores [(7.0) 8.0–10 × 7–9 μm], as well as an orange pore surface in many specimens. Amauroderma schomburgkii also has a robust pileus, with similar consistency, black bands in the context and small pores, but differs in its darker context, smaller spores and a cortex in the pilear surface. Amauroderma pseudoboletus presents a context with similar color and similar spore size, and can be distinguished by its conspicuous ornamentation of spores. Furtado 1981, Ryvarden 2004 and Gomes-Silva et al. 2015 described the basidiospores as globose to subglobose, differing from our observations of subglobose to broadly ellipsoid [Q = (1.07) 1.08–1.27 (1.30), ave-Q = 1.18].

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.