Sidera tenuis Y.C. Dai, F. Wu, G.M. Gates & Rui Du, 2020

Du, Rui, Wu, Fang, Gate, Genevieve M., Dai, Yu-Cheng & Tian, Xue-Mei, 2020, Taxonomy and phylogeny of Sidera (Hymenochaetales, Basidiomycota): four new species and keys to species of the genus, MycoKeys 68, pp. 115-135 : 115

Sidera tenuis Y.C. Dai, F. Wu, G.M. Gates & Rui Du sp. nov. Figures 10 , 11

Type material.

Holotype: Australia. Tasmania, Hobart, Mt Wellington, on rotten wood of Eucalyptus , 13 May 2018, Y.C. Dai 18697 (BJFC 027166, isotype in MEL).

Etymology.

Tenuis (Lat.), refers to the species having narrow basidiospores.

Description.

Basidiomata: Annual, resupinate, soft and waxy when fresh, soft corky when dry, up to 10 cm long, 3 cm wide, and approximately 1 mm thick at center; pore surface white when fresh, becoming cream when dry; sterile margin indistinct; pores round, 8-10 per mm; dissepiments thin, entire; subiculum very thin to almost absent; tubes concolorous with poroid surface, up to 1 mm long.

Hyphal structure: Hyphal system dimitic, generative hyphae bearing clamp connections; skeletal hyphae dominant, unbranched, interwoven, 2-3 μm in diam; all hyphae IKI-, CB-, and unchanged in KOH.

Subiculum : Generative hyphae hyaline, thin-walled, frequently branched, 1-2.5 µm in diam, some with distinctly swollen tips which in shape are globose, bottle-shaped or irregularly elongated; skeletal hyphae dominant, unbranched, interwoven, 2-3 μm in diam; rosette-like crystals frequently present, 2.5-10 µm in diam, some irregular rhomboidal crystals present.

Tubes: Generative hyphae hyaline, thin-walled, frequently branched, 1-2.5 µm in diam, some with swollen tips, dominant at dissepiment edges; skeletal hyphae with a narrow lumen to subsolid, unbranched, interwoven, 2-3 µm diam; rosette-like and irregular rhomboidal crystals abundant; cystidia absent; cystidioles present, fusoid, hyaline, thin-walled, swollen at base, with a sharp or often hyphoid neck, 6-25 × 2.5-4.5 μm; basidia barrel-shaped, hyaline, bearing four sterigmata and a basal clamp connection, 7.3-11 × 3.5-5 μdm; basidioles in shape similar to basidia, but slightly shorter.

Basidiospores: Allantoid, thin-walled, smooth, usually with one or two small guttules, IKI-, CB-, (4.1-)4.2-5(-5.4) × (0.7-)0.8-1(-1.2) μm, L = 4.62 μm, W = 0.95 μm, Q = 4.73-4.95 (n = 60/2).

Additional specimen examined (paratype).

Australia. Hobart, Mt Wellington, on rotten wood of Eucalyptus , 13 May 2018, Y.C. Dai 18698 (BJFC 027167).

Figures

Figure 10. A basidioma of Sidera tenuis (holotype, Dai 18697). Scale bar: 1 cm. Photo by Yu-Cheng Dai.

Figure 11. Microscopic structures of Sidera tenuis (holotype, Dai 18697) a basidiospores b basidia, basidioles c cystidioles d hyphae from subiculum e hyphae from trama f hyphae at dissepiment edge. Drawings by Rui Du.