Trullella conifericola T. Cao & H.S. Yuan, 2021

Cao, Ting, Yu, Jia-Rui, Nguy ễn, Trang Th ị Thu & Yuan, Hai-Sheng, 2021, Multiple-marker phylogeny and morphological evidence reveal two new species in Steccherinaceae (Polyporales, Basidiomycota) from Asia, MycoKeys 78, pp. 169-186 : 169

Trullella conifericola T. Cao & H.S. Yuan sp. nov. Figures 4 , 5

Diagnosis.

Basidiocarps annual, Mycorrhaphium sessile or laterally stipitate; pileus flabelliform to semi-circular; pileal surface hirtellous, with appressed coarse hair, concentrically zonate and sulcate; pores round to angular. Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae CB+, IKI-. Basidiospores cylindrical to allantoid, thin-walled.

Holotype.

Vietnam. Lam dong Province, Lac Duong District, Lac Duong District, Bidoup Nui Ba National Park, on fallen branch of Pinus kesiya , 15.X.2017, Yuan 12655 (holotype IFP 019372).

Etymology.

Trullella Conifericola (Lat.), referring to growth on the coniferous substrate.

Description.

Basidiocarps annual, Mycorrhaphium sessile or laterally stipitate, solitary to imbricate, without special odor or taste, leathery when fresh, shrinking, hard corky and light in weight upon drying. Pileus flabelliform to semi-circular, applanate, projecting 4-10 cm and 1 cm thick at the base; pileal surface hirtellous, with appressed coarse hair, concentrically zonate and sulcate, alternating white and greyish orange (6A1-6B3) when fresh, yellowish white (2A2/3A2/4A2) and nearly azonate when dry; margin acute, drying involute and wavy. Pore surface light orange (5A4), shiny; pores round to angular, tiny, 10-12 per mm, hardly visible to the naked eye; dissepiments entire; sterile margin ca. 1 mm wide. Context color paler than pores and upper surface, yellowish white (2A2-3A2), soft corky, azonate, 0.5-1.5 mm thick. Tubes non-stratified, concolorous with pore surface, dense, ca. 1.5 mm thick when dry. Stipe round, glabrous and smooth, light yellow to greyish yellow (4A4-4B5), 0.5-2 cm long and 2-4 mm in diam, dense and homogenous.

Hyphal structure. Hyphal system dimitic: generative hyphae bearing clamp connections, skeletal hyphae CB+, IKI-; tissues unchanged in KOH.

Context. Dominated by generative hyphae, interwoven; generative hyphae hyaline, thin- to slightly thick-walled, clamp connections abundant, frequently branched, 2.5-5.5 μm diam; skeletal hyphae hyaline, thick-walled with a wide lumen, unbranched, 1.5-5 μm diam.

Tubes. Dominated by skeletal hyphae, interwoven; generative hyphae hyaline, thin- to slightly thick-walled, moderately branched, 2-4 µm diam; skeletal hyphae hyaline, thick-walled to semisolid, straight to flexuous, unbranched, 1.5-3.5 µm diam. Cystidia or other sterile hymenial elements absent. Basidia short 8-15 × 4-5.5 µm, clavate, 4-sterigmata of 0.5-1 µm in length, with a clamp connection at base; basidioles similar to basidia in shape, but slightly smaller.

Basidiospores. Cylindrical to allantoid, slightly curved, hyaline, thin-walled, smooth, CB-, IKI-, (4.0-)4.1-5.5(-5.8) × (1.6-)1.8-2.3(-2.5) µm, Lm = 4.94 µm, Wm = 2.09 µm, Q = 2.36-2.45 (n = 60/2).

Ecology.

On fallen gymnosperm branch, causing a white rot.

Distribution.

In high altitude area of subtropical to tropical zones.

Additional specimens examined.

China. Fujian Prov., Wuyishan Forest Park, on fallen trunk of Pinus kesiya , 16.IX.2005, Cui 2851 (IFP 000645) . Vietnam. Lam dong Province, Lac Duong District, Bidoup Nui Ba National Park , on fallen branch of Pinus kesiya , 15.X.2017, Yuan 12657 (IFP 019373) .

Figures

Figure 4. Basidiocarps of Trullella conifericola (IFP 019372, holotype). Scale bar: 10 mm.

Figure 5. Microscopic structures of Trullella conifericola (IFP 019372, holotype) a basidiospores b basidia and basidioles c hyphae from trama d hyphae from context.