Amauroderma omphalodes (Berk.) Torrend, Brotéria Série Botânica, 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

Amauroderma omphalodes (Berk.) Torrend, Brotéria Série Botânica 18: 131 (1920). Figs. 7 d–e , 8 d

≡ Polyporus omphalodes Berk. , Hooker’s Journal of Botany and Kew Garden Miscellany 8: 172 (1856a)

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

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

Distribution:— Brazil to Belize. In Brazil, this species has been recorded from Amazonia, 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 de Noiva , 19 February 2012, Alves-Silva GAS s/n ( FLOR 52222 ) ; 19 February 2012, Alves-Silva GAS90 ( FLOR 52218 ) ; 19 February 2012, Alves-Silva GAS131 ( FLOR 52221 ) ; 20 May 2012, Alves-Silva GAS171 ( FLOR 52217 ) ; 19 February 2012, Alves-Silva GAS172 ( FLOR 52225 ) ; 19 February 2012, Alves-Silva GAS198 ( FLOR 52223 ) ; 01 May 2013, Alves-Silva GAS475 ( FLOR 52224 ) ; Sítio Vale do Rio Claro , 07 January 2013, Costa-Rezende DHCR112 ( FLOR 52216 ) .

Comments:— Amauroderma omphalodes is characterized by its stipitate, dull, very pale brown to dark reddish brown pileus, a pale context with dark bands from the stipe and globose to broadly ellipsoid spores, (10) 11–14 (15) × (8) 9–12 (13) μm, that are pale yellow, thick-walled and have conspicuous ornamentation.

It shares similarities with A. camerarium , A. praetervisum , A. pseudoboletus (Spegazzini) J.S. Furtado (1968: 230) and A. sprucei . Amauroderma camerarium also has a pale context and large thick-walled spores with conspicuous ornamentation, however it differs in having a homogeneous context ( Ryvarden 2004, Gomes-Silva et al. 2015). Amauroderma praetervisum and A. pseudoboletus also have black bands in the context and large spores; however, the paler, thinner walls and less conspicuous endosporic ornamentation of spores from A. praetervisum are distinctive features. Furthermore, A. praetervisum has a darker pilear surface. Amauroderma pseudoboletus has larger pores, 3- 5/mm [(210) 250–350 (400) vs (3) 4–7/mm, (80) 110–210 (230) μm in diameter]. Amauroderma sprucei also has a pale context and small pores, and can be distinguished mainly by its pale ochraceus to orange pore surface (usually observed in many specimens) and the smaller spores [(7) 8–10 × 7–9 vs (10) 11–14 (15) × (8) 9–12 (13) μm]. According to the literature, the basidiospores of A. omphalodes are described as globose to subglobose ( Furtado 1981, Ryvarden 2004, Gomes-Silva et al. 2015), which differs from our observations of globose to broadly ellipsoid spores (Q = 1.00–1.30, ave-Q = 1.16).

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.