Fulvifomes centroamericanus Y.C. Dai, X.H. Ji & Vlasak

Ji, Xiao-Hong, Wu, Fang, Dai, Yu-Cheng & Vlasak, Josef, 2017, Two new species of Fulvifomes (Hymenochaetales, Basidiomycota) from America, MycoKeys 22, pp. 1-13 : 1-2

Fulvifomes centroamericanus Y.C. Dai, X.H. Ji & Vlasak sp. nov. Figs 3, 4

Holotype.

GUATEMALA. Tikal, 4 Nov 2006, leg. J. Kout, on living angiosperm tree, JV0611/III (Holotype in JV, isotype in BJFC).

Etymology. Centroamericanus (Lat.): referring to the distribution of species.

Description.

Basidiocarps perennial, sessile, broadly attached, solitary, without odor or taste, woody hard, light in weight when dry. Pilei dimidiate, applanate, projecting up to 15 cm, 20 cm wide and 8 cm thick at the base. Pileal surface dark grey, crusted, uncracked; margin cinnamon-buff, obtuse. Pore surface pale yellow, shining; sterile margin distinct, yellowish brown, up to 3 mm wide; pores circular, 8-10 per mm; dissepiments thick, entire. Context yellowish brown, woody hard, up to 5 cm thick. Tubes yellowish brown, woody hard, up to 3 cm thick, tube layers distinctly stratified with intermittent context layers, individual tube layer up to 2 mm thick.

Hyphal structure.

Hyphal system dimitic; generative hyphae simple septate; skeletal hyphae dominant; tissue darkening but otherwise unchanged in KOH.

Context. Generative hyphae yellowish, slightly thick-walled, unbranched, frequently simple septate, 2-3.5 µm in diam; skeletal hyphae dominant, pale yellow to brown, thick-walled with a wide lumen, unbranched, aseptate, regularly arranged, 3-5 µm in diam.

Tubes.

Generative hyphae hyaline to pale yellow, thin- to slightly thick-walled, rarely branched, frequently simple septate, 1.5-3 mm in diam; skeletal hyphae dominant, pale yellow, thick-walled with a wide to narrow lumen, rarely branched, aseptate, interwoven, 2-3 mm in diam. Setae absent; cystidia and cystidioles absent; hymenium collapsed, basidia and basidioles not obserbed.

Spores.

Basidiospores subglobose, yellowish brown, thick-walled, smooth, usually collapsed when mature, IKI–, CB–, (3.8 –)3.9–4.5(– 4.6) × (3.5 –)3.7– 4.2 μm, L = 4.11 μm, W = 3.92 μm, Q = 1.04-1.05 (n = 60/2).

Additional specimen examined

(paratypes). COSTA RICA. Las Pailas Ranger Station, Rincon de la Vieja, July 2016, on living angiosperm tree, JV1607/90 (JV); 1 Aug 2014, on living angiosperm tree, JV1408/4 (JV, BJFC). GUATEMALA. Uaxactún, 2 Nov 2006, leg. J. Kout, on living angiosperm tree, JV0611/8P (JV).