Ganoderma suae J. He & S. H. Li, 2024

He, Jun, Li, Xiao-Jun, Tan, Wan-Zhong, Wu, Xiao-Qu, Wu, Dan, Luo, Zong-Long, Zhou, Qi Wu, Li, E-Xian & Li, Shu-Hong, 2024, Two new species of Ganoderma (Ganodermataceae, Basidiomycota) from Southwest China, MycoKeys 106, pp. 97-116 : 97-116

Ganoderma suae J. He & S. H. Li sp. nov.

Fig. 3

Diagnosis.

Differs from other species in the genus by its large and substipitate basidiomata, reddish brown to oxblood red pileus surface with concentric furrows and radial rugose, whitish and wavy margin, almond-shaped basidiospores, heterogeneous context and non-stratified tubes.

Etymology.

The epithet ‘ suae ’ refers to the Chinese mycologist Prof. Hong-Yan Su, for her great contribution to the mycology.

Holotype.

China. Yunnan Province., Honghe City , lvchun County, on a dead stump of a broad-leaved tree, alt. 1392 m, Jun He, 24 June 2019, L 4651 ( HKAS 123791 ).

Description.

Basidiomata annual, sessile to substipitate, and occasionally imbricate, woody-corky, light in weight. Pileus round-flabelliform to reniform, slightly convex to applanate; surface glabrous, projecting up to 15 cm, 10 cm wide and 2 cm thick at base. Pileus surface reddish brown (6 F 8) to oxblood red (9 E 7), weakly to strongly laccate, and covered by a thin hard crust, concentrically zonate or azonate. Margin whitish to generally concolorous, entire, acute to obtuse, smooth to irregularly wavy. Context up to 0.8 cm thick, heterogeneous, the upper layer greyish white (2 B 1), the lower layer cinnamon brown (6 D 7) to chestnut brown (6 F 7), bearing distinct concentric growth zones, without black melanoid lines, hard corky and fibrous. Tubes 0.2–1.2 cm long, grayish brown (6 B 3), corky, unstratified. Pores 4–6 per mm, circular to angular, dissepiments slightly thick, entire; pore surface lead gray (2 D 2) to greyish white (2 B 1) when fresh, golden grey (4 C 2) to soot brown (5 F 5) when bruising or aging. Stipe up to 4.5 cm long and 3.0 cm diam, generally short and thick, cylindrical, horizontal or lateral, fibrous to spongy, reddish brown (6 F 8) to dark brown (8 F 8), concolorous to generally darker than pileus.

Hyphal system trimitic. Generative hyphae 2.0–3.0 μm in diameter, colorless, thin-walled, hyaline, unbranched, abundant, with clamp connections; skeletal hyphae 3.0–9.0 μm in diameter, thick-walled with a narrow lumen to subsolid, non-septate, moderately branched, orange yellow to golden-yellow, predominant; binding hyphae 1.0–2.0 μm in diameter, subthick-walled to solid, non-septate, frequently branched, interwoven, colourless to yellowish, scarce, notably thinner and paler than skeletal hyphae; all the hyphae IKI –, CB +; tissues darkening in KOH.

Culture characteristics. Initially, white to yellowish white, pale yellow when growing, become orange white, pale orange, light orange and some reddish yellow to dark brown around the plugged circle of active mycelium after incubation for 3 weeks.

Pileipellis a crustohymeniderm, cells 24–43 × 6–11 μm, thick-walled to sub-solid, apical cells narrowly clavate to clavate, slightly inflated, yellowish to golden-yellow, without granulations in the apex; negative or apex slightly amyloid.

Basidiospores almond-shaped to narrow ellipsoid, apex subacute, with apical germ pore, yellowish to yellowish-brown, IKI –, CB +, inamyloid; double-walled, exospore smooth, endospore with coarse echinulate, exosporium with inter-walled pillars 0.5–0.6 μm thick; (80 / 4 / 2) (8.0) 9.0–9.7 – 10.5 × (5.0) 5.5–6.1 – 6.5 (7.0) μm, L = 9.70 µm, W = 6.10 µm, Q = (1.38) 1.45–1.79 (1.97), Q m = 1.61 ± 0.13 (including myxosporium). Basidia barrel-shaped to widely clavate, colorless, with a clamp connection and four sterigmata, thin-walled, 9–18 × 9–12 µm; basidioles pear-shaped to fusiform, colourless, thin-walled, 8–14 × 6–11 µm.

Additional specimens examined.

China, Yuannan Province, Lingcang City , Yun County, on a living Quercus sp. tree, alt. 1516 m, Jun He, 4 August 2019, L 4817 ( HKAS 123777 ) .

Notes.

Phylogenetic analyses showed that Ganoderma suae clusters as a sister taxon to G. resinaceum with good statistical support (100 % ML / 1.00 PP, Fig. 1 ). Morphologically, G. resinaceum differs from G. suae by having smaller basidiomata, reddish brown to oxblood red pileus surface and wavy margin, homogeneous context, longer pileipellis (34–59 × 6.2–9.3 μm), and larger basidiospores (11.2–12.5 × 6.5–7.4 μm, Náplavová et al. 2020; Ryvarden 2000; Torres-Torres et al. 2012).

Ganoderma zonatum also has sessile basidiomata and a whitish pileus margin, but it differs from G. suae by having an apex widened to swollen of pileipellis cells (30–70 × 5–12 μm), and larger basidiospores (11.2–12.5 × 6.5–7.4 μm, Murrill 1902).

Figures

Figure 1. Maximum likelihood (ML) tree based on combined ITS + nrLSU + TEF 1 - α + RPB 2 sequence data. Bootstrap support values with a maximum likelihood (ML) equal to or greater than 60 % and Bayesian posterior probabilities (PP) equal to or greater than 0.90 are given above the nodes, shown as “ ML / PP ”. New species are indicated in bold blue.

Figure 3. Ganoderma suae (HKAS 123791, holotype) A, B basidiomata C pore surface D cut side of pileus E sections of pellis F skeletal hyphae from context E generative hyphae from tubes H binding hyphae from context I – K basidia and basidioles L – O basidiospores. Scale bars: 30 μm (E – H); 10 μm (I – K, O); 5 μm (L – N); 20 mm (P, Q).