Name: Ganoderma mexicanum Pat.
Most Confident Observations:
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First person to use this name on MO: Erlon Bailey
Editors: Chaelthomas

Notes on Taxonomy: [Edit]

Ganoderma mexicanum Pat., Bull. Soc. mycol. Fr. 14: 54 (1898). Figs 5, 19 Basidiomata 6.2–11.2 × 9–19 × 1.6–2.5 cm, annual, sessile, woody, but light in weight when dry. Pileus round-flabelliform to semicircular, convex to applanate; surface glabrous, rugose, semiglossy; with a laccate crust, thin, not easily cracked or removed, but easy to penetrate with the fingernail, concentrically sulcate; surface reddish-black in a 80% of the surface to brown- violet (11F5) towards the margin, almost homogeneous; margin henna (7E8) to concolorous with the pileus, slightly lobulate, thin to thick, obtuse, smooth.Ganoderma (Brazil) … 107
per mm, round, woody; pore surface pale yellow (2A3); tubes 0.8–1.1 cm thick, unstratified, concolorous with the lower part of the context. Hyphal system dimitic. Contextual trama: generative hyphae 1.8–5 μm diam., thin-walled, hyaline, non-branched; skeletal hyphae 1.9–9.3 μm diam., thick-walled to generally solid, non-septate, arboriform, yellowish. Hymenophoral trama as the contextual trama. Pileipellis a crustohymeniderm, cells 35.2–72.4 × 6.8–10.5 μm, clavate to narrowly clavate, some apically widened, entire or rarely with one lateral protuberance; very thick-walled, golden-brown to yellowish- brown, without granulations in the apex; dextrinoid. Basidiospores 9.3–10.6 × 6.2–7.4 μm, Q = 1.42–1.54, ellipsoid, apex truncate, yellowish-brown, inamyloid; perisporium wrinkled, reddish-brown; exosporium with inter- walled pillars 0.3 μm thick, subfree. Basidia not observed. Cystidia absent.
Habitat: Not specified.
Material examined: MEXICO, Estado de México, D. de Jonacatepec, Tepalcingo, 22 October 1890, s. coll. (FH, lectotype). BRAZIL, São Paulo, Tremembé, Horto Florestal de Cantareira, on trunk of Araucaria angustifolia, 3 March 1953, C.D.F. Pacheco s.n. (SP109514).
Remarks: The most important features of G. mexicanum are a not fully homogeneous context, apically widened pileipellis cells, and small basidiospores with subfree pillars. The studied specimen agrees with the lectotype, which, however, “seems” to have a homogenous context without resinous bands. A possible explanation is that the type is poorly conserved with most of the context destroyed. This species was previously known only from the type locality (Patouillard 1898). This is the second record of the species for the world.

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By: Chaelthomas (Chaelthomas)
2018-03-21 15:24:24 CDT (-0400)

Ganoderma in Brazil: known species and new records (2012)

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Created: 2015-02-17 21:15:30 CST (-0500) by Erlon Bailey (Herbert Baker)
Last modified: 2018-03-21 15:26:38 CDT (-0400) by Chaelthomas (Chaelthomas)
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