Name: Ganoderma orbiforme (Fr.) Ryvarden
Most Confident Observations:
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First person to use this name on MO: walt sturgeon
Editors: Erlon, Chaelthomas

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“Among the names assigned to this species, G. fornicatum given to Asian collections has nomenclatural priority over the others. However, the type of G. fornicatum from Brazil is probably lost and a modern description based on the type lacks. The identification of the Asian collections to G. fornicatum therefore cannot be confirmed. To the best of our knowledge, G. orbiforme is the earliest valid name for use.”

Wang, D. M., Wu, S. H., & Yao, Y. J. (2014). Clarification of the Concept of Ganoderma orbiforme with High Morphological Plasticity. PloS one, 9(5), e98733. http://journals.plos.org/...

Ganoderma orbiforme (Fr.) Ryvarden, Mycologia 92: 187 (2000). Figs 7, 21 Basidiomata 4–6.5 × 5–8 × 1.5–2 cm, perennial, sessile, occasionally imbricate, woody. Pileus round-flabelliform, convex to applanate; surface glabrous, bumpy, glossy; with a laccate crust, thin, not easily cracked or removed, but easy to penetrate with the fingernail, concentrically sulcate; surface very dark reddish-black in 80–90% of the surface to light-brown (6D8) toward the margin; margin light-brown (6D8), entire, obtuse, generally sulcate. Context 0.8–1 cm thick, fibrous, not fully homogeneous, light golden-brown (5D) to rust-brown (6E8) toward the tubes, zonate; with discontinuous resinous bands. Pores 4–8 per mm, round, woody; pore surface yellow (3A6); tubes 0.7–0.9 cm thick, unstratified to stratified, concolorous with the lower part of the context. Hyphal system trimitic. Contextual trama: no generative hyphae Ganoderma (Brazil) … 111
exosporium with inter-walled pillars 0.4–0.5 μm thick, subfree. Basidia not observed. Cystidia absent.
Habitat: Atlantic rain forest, artificial Pinus forest.
Material examined: GUINEA, without data, A. Afzelius s.n. (UPS, holotype). BRAZIL, Rio de Janeiro, Angra de Reis, Ilha da Gilpoia, 4 March 1956, O. Fidalgo F-365 (SP95346); Paraná, Paranaguá, Ilha do Mel, on dead standing trunk of Ocotea pulchella, 6 May 1989, A.A.R. de Meijer 1234 (EMBRAPA); São Paulo, Água Funda, Secretaria de Agricultura, on trunk of Pinus sp., 31 March 1986, M.A. de Jesus s.n. (SP211911); Trilha do Jardim Botânico de São Paulo, 12 February 2004, A.M. Gugliotta & G.R. Leal 1205 (SP382045).
Remarks: Ganoderma orbiforme is characterized by a very dark (almost black) pileus, not fully homogenous context, pileipellis cells with many protuberances and branches, and basidiospores with subfree pillars. The Brazilian specimens agree with the holotype, although it comprises only one poorly conserved basidiome with only rust-brown (6E8) context remnants, from which it is impossible to elucidate structure or presence of resinous bands. Ryvarden (2000, 2004) described broadly ellipsoid basidiospores, but this shape agrees with neither his measurements (10–11 × 6–7 μm) nor the ellipsoid basidiospores of the type specimen (9–11 × 7–8 μm). Ganoderma orbiforme is morphologically similar to G. multiplicatum, but the latter has smaller basidiospores (8–9.9 × 6.2–6.8 μm) with free pillars and pileipellis cells with only short protuberances. Although recorded from the states of Amazonas and Paraná, Brazil by de Meijer in 2006 (Baltazar & Gibertoni 2009), Gomes-Silva et al. (2011), and Ryvarden & de Meijer (2002), G. orbiforme probably has a wider tropical distribution. We record this species from the states of Rio de Janeiro and São Paulo here for the first time.

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Created: 2012-01-22 14:37:23 EST (-0500) by walt sturgeon (Mycowalt)
Last modified: 2018-03-21 15:35:47 EDT (-0400) by Chaelthomas (Chaelthomas)
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