Inonotus pseudolinteus Vlasak & Y. C. Dai 2013, sp. nov.
Creators: name: Vlasák, Josef
name: Li, Hai-Jiao
name: Zhou, Li-Wei
name: Dai, Yu-Cheng
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Hymenochaetales
Hymenochaetaceae
Inonotus
Inonotus pseudolinteus

description: Inonotus pseudolinteus Vlasák & Y.C. Dai, sp. nov. (Figs. 4, 5)   
MycoBank MB 803767  
 Type. — VENEZUELA. SanFelix, town park, on living angiosperm wood, 2 April 2004, J. Kout, JV 0404 / 35-K (Holotype in PRM 861184, isotype in BJFC 14700).   
 Etymology.— pseudolinteus (Lat.): resembling Inonotus linteus.   
 Fruitbody. —Basidiomata perennial, pileate, semicircular to dimidiate, ungulate, woody hard when dry. Pilei projecting up to 3 cm, 4.5 cm wide and 4.5 cm thick at base. Pileal surface fuscous to black, concentrically sulcate, matted, cracked with age; margin obtuse, fuscous. Pore surface cinnamon to greyish brown when dry; sterile margin indistinct; pores circular, 4–5 per mm; dissepiments thin to moderately thick, about 40–100 Μm thick, entire. Context cinnamon, woody hard, up to 4 cm thick. Tubes cinnamon to yellowish-brown, woody hard, up to 5 mm long, tube layers mostly indistinct.   
 Hyphal structure. —Hyphal system monomitic in context, dimitic in the hymenophoral trama; generative hyphae simple septate; tissue darkening in KOH.   
 Context. —Generative hyphae yellow to golden brown, varying from slightly thick-walled to thick-walled, frequently simple septate, straight, more or less regularly arranged, 2.5–4 Μm in diam.   
 Tubes. —Generative hyphae hyaline to pale yellowish, thin- to slightly thick-walled, moderately branched, frequently septate, 1.8–2.5 Μm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a distinct lumen, unbranched, straight, subparallel along the tubes, 2–3 Μm in diam. Hymenial setae rare in the hymenium and dissepiments, mostly subulate, sometimes ventricose, dark brown, thick-walled, 20–34 × 5–7 Μm; basidia clavate, with four sterigmata and a simple septum at the base,13–15 × 6–7 Μm; basidioles in shape similar to basidia, but slightly smaller.   
 Basidiospores. — Broadly ellipsoid, usually collapsed when mature, yellowish and thick-walled, smooth, IKI–, CB –, (4.7–)4.8–5.8(–6) × (3.3–)3.7–4.6(–4.9) Μm, L= 5.23 Μm, W = 4.09 Μm, Q = 1.25–1.27 (n = 60/2).   
 Paratypes. — USA. Florida, Florida Keys, Windley Key, Fossils Reef Geological State Park, angiosperm wood, 22 December 2003, J. Vlasák Jr., JV 0312 / 22.10-J (PRM 861185, JV, BJFC 14701), JV 0312 /20.10-J (JV).   
 Notes.— Inonotus pseudolinteus is morphologically very similar to I. linteus. However, I. linteus has abundant hymenial setae, while hymenial setae are rarely present in I. pseudolinteus. In addition, skeletal hyphae in Inonotus linteus become swollen in KOH, while they keep unchanged in I. pseudolinteus.   
 Inonotus pseudolinteus is probably widely distributed in Central America. This species was treated as Inonotus sp. by Tian et al. (2013), and its ITS sequences (AF 534075 and AY 558629) was recognized as I. linteus in GenBank.
description: Published as part of Vlasák, Josef, Li, Hai-Jiao, Zhou, Li-Wei & Dai, Yu-Cheng, 2013, A further study on Inonotus linteus complex (Hymenochaetales, Basidiomycota) in tropical America, pp. 25-36 in Phytotaxa 124 (1) on pages 30-31, DOI: 10.11646/phytotaxa.124.1.3, http://zenodo.org/record/5085072