Sidera srilankensis 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 srilankensis Y.C. Dai, F. Wu, G.M. Gates & Rui Du sp. nov. Figures 8 , 9

Type material.

Holotype: Sri Lanka. Western Province, Mitirigala Nissarana, Vanaya Forest, on rotten angiosperm wood, 4 Mar 2019, Y.C. Dai 19654 (BJFC, isotype in University of Ruhuha).

Etymology.

Srilankensis (Lat.), refers to the species being found in Sri Lanka.

Description.

Basidiomata: Annual, resupinate, soft when fresh, soft corky to fragile when dry, up to 16.5 cm long, 3 cm wide, and approximately 1 mm thick at center; pore surface cream when fresh, becoming buff yellow upon drying; sterile margin distinct, fimbriate, thinning out; pores round, 6-8 per mm; dissepiments thin, lacerate; 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, 1.5-3 µm diam; all hyphae IKI-, CB-, unchanged in KOH.

Subiculum : Generative hyphae hyaline, thin-walled, frequently branched, 1-2 µm in diam; skeletal hyphae dominant, more or less straight, unbranched, interwoven, 1.5-3 μm diam; rosette-like crystals frequently present, 3.5-12 µm in diam, some irregular rhomboidal crystals present.

Tubes: Generative hyphae hyaline, thin-walled, frequently branched, 1-2 µm in diam; skeletal hyphae with a narrow lumen to subsolid, unbranched, interwoven, 1.5-3 µm diam; skeletal hyphae and generative hyphae co-dominating at dissepiment edges; rosette-like and irregular rhomboidal crystals abundant; cystidia absent; cystidioles present, fusoid, hyaline, thin-walled, basally swollen, with a sharp or often hyphoid neck, 8.1-14 × 3-4.1 μm; basidia barrel-shaped, hyaline, bearing four sterigmata and a basal clamp connection, 7.8-13.2 × 3.6-4.5 μm; basidioles in shape similar to basidia, but slightly shorter.

Basidiospores: Lunate, hyaline, thin-walled, smooth, occasionally with one or two guttules, IKI-, CB-, (3.4-)3.5-4(-4.1) × 1-1.3(-1.4) μm, L = 3.83 μm, W = 1.16 μm, Q = 3.28-2.34 (n = 60/2).

Additional specimen examined (paratype).

Sri Lanka. Kandy, Udawatta Kele, Royal Forest Park, on rotten angiosperm wood, 2 Mar 2019, Y.C. Dai 19581 (BJFC).

Figures

Figure 8. A basidioma of Sidera srilankensis (holotype, Dai 19654). Scale bar: 1 cm. Photo by Yu-Cheng Dai.

Figure 9. Microscopic structures of Sidera srilankensis (holotype, Dai 19654) a basidiospores b basidia, basidioles c cystidioles d hyphae from subiculum e hyphae from trama f hyphae at dissepiment edge. Drawings by Rui Du.