A new species of Bjerkandera (Polyporales, Basidiomycota) from Europe Tomšovský, Michal Sabet, Victor Welti, Stéphane Moreau, Pierre-Arthur Dumez, Sylvain Phytotaxa 2025 2025-05-13 701 1 95 104 Tomsovsky, V. Sabet, Welti, P.-A. Moreau & Dumez Tomsovsky, V. Sabet, Welti, P. - A. Moreau & Dumez 2025 [136,983,1588,1615] Agaricomycetes Meruliaceae Bjerkandera Fungi Polyporales 4 99 Basidiomycota species lecomtei sp. nov.  Etymology:—  lecomtei,dedicated to the Belgian mycologist Marcel Lecomte for generously shearing his broad experience in microscopy and field mycology. Diagnosis:—Differs from temperate  Bjerkanderaspp.by resupinate basidiomes and absence of differentiated hypophyllum (“black line”). Similar  Bjerkandera carnegieaeand  B. resupinatahave different basidiospores and DNAsequences of ITS and LSU regions of ribosomal RNA gene.   Holotype:— Czechia, Bulhary, dead arm of river, alluvial forest NEof the village, 12 kmBW of Břeclav,  Acer campestre—on fallen trunk, coordinates approximately 48.8348564N, 16.7571736E, elevation 170 m,  04 May 1993, Petr Vampola ( P. Vampola 134/93), holotype MJ 2889, isotype BRNM 844459.  Basidiomata annual, resupinate, adnate, corky, occasionally up to  1 mbroad, with a width between 30 and 50 cm., 0.5 mmthick at base. Pore surfacewhitish when fresh then yellow ochre to yellowish brown or brownish (5 C6, 5 C 7, 5E8), deep brownish when dry, sterile margin thin pale white to cream (4 A3), slightly fimbriate (or tomentose); pores mostly angular, sometimes rounded, 1–4 (5) per mm; dissepiments thin, entire to lacerated. Subiculumpale cream (4 A3); up to 0.2 mmthick with a distinct hymenopodial zone between subiculum and tubes in the typecollection, not distinct in French (indoor) collections. Tubes up to 3 mmlong, concolorous with the pore surface (5 C6, 5 C7), becoming dark in KOH.   FIGURE 3.Basidiomata of  Bjerkandera lecomteiBRNM844459. a General view of basidiome. b Subiculum and tubes. c Tubes.  Basidiosporeson holotype, n = 35 (5.5–)5.7–6.8–8(–8.3) × (3.4–)3.5–3.8–4.2(–4.9) μm, Q = (1.49–)1.56–1.81– 2.03(–2.14); on V. Sabet 2464, n =35) (4.9–)5.5–6.1–6.7(–7.2) × (2.9–)3.2–3.5–3.9(–4.0) µm, Q = (1.4–) 1.6–1.7– 2.0(–2.1); average values of both specimens L = 6.46 μm, W = 3.66 μm, Q = 1.76; ellipsoid or cylindro-ellipsoid, some slightly allantoid, thin-walled; negative in Melzerˈs reagent. Basidia14.4–21.5 × 4.6–6.5μm, clavate, 4-spored; basidioles similar, 3.3–5.1 μm wide. Cystidia and cystidiolesabsent. Hyphal systemmonomitic, generative hyphae with clamp connections, smooth, colourless; hyphae of subiculum thick-walled with a wide lumen, rarely branched, 3.5–4.9 μm in diam; hyphae of tubes thin- to slightly thick-walled, frequently branched, 2.3–3.6 μm in diam. The French material is somewhat distinct from the description of the Czech collection in its subiculum, which is approximately 300 µm thick and characterized by an alternation of compact zones composed of fascicles of unbranched, either horizontally or vertically oriented hyphae (3–8 µm wide) with moderately thickened walls (0.3–1 µm thick, locally yellowish in KOH), and looser zones predominantly composed of thin- to thick-walled, frequently branched and lobate, interwoven hyphae (2–4 µm wide). The tramal hyphal system is mainly composed of fascicles of unbranched, vertically oriented hyphae thinner (<4 µm) and shorter hyphae, thin or thick-walled, often highly and shortly branched, together forming a compact and cohesive structure overall.   Materialexamined: CZECHIA. South Moravian Region, Bulhary, dead arm of river, alluvial forest NEof the village, 10 kmBW of Břeclav,  Acer campestre—on fallen trunk, coordinates approximately 48.8348564N, 16.7571736E,  170 ma.s.l.,  04 May 1993, Petr Vampola ( P. Vampola 134/93), holotype MJ 2889, isotype BRNM 844459; PP104713 (ITS),  PP104712( LSU). FRANCE. Loiret, Jargeau, on a house beam (  Quercussp),  Nov 2024, Pierre-Yves Sachot ( V. Sabet, 2280, LIP); GenBank: PV226174 ( ITS), PV226177( LSU). Samelocality,  12 Dec 2024, Pierre-Yves Sachot ( V. Sabet, 2464, LIP);  Genbank: PV226175 ( ITS). Meurthe-et-Moselle, Jarville-la-Malgrange, on a house beam,  24 January 2025( V. Sabet, 2686, LIP); Genbank: PV226176 (ITS).   FIGURE 4.Microscopic structures of  Bjerkandera lecomtei(MJ 2889, holotype). a Hymenium. b Basidiospores. c Generative hyphae. Scale bars: a–c = 5 μm. Notes:  Bjerkandera lecomteiis similar to  Raduliporus aneirinus( Ceriporiopsis aneirina). The two species differ in size of basidia and DNAsequences, while the dimensions of basidiospores and pores overlap. Other similar polypore occurring in the same habitat is  Pouzaroporia subrufahaving distinctly dimitic hyphal system. The color of  B. lecomteibasidiomes is close to that of  B. carnegieaebut the species differ in ecology and basidiospore dimensions. The description of  B. lecomteiis based one old herbarium specimen (collected in 1993 innature) and three recent indoor collections in France. No fresh basidiome of the species was found recently in the typelocality. 1993-05-04 NE, P Czech Republic 170 48.834858 Bulhary 1 16.757174 Breclav 4 99 MJ 2889, BRNM 844459 3 holotype C 1 7.5 4 99 C6, 5, A3 1 A 5 100 A3 1 KOH 5 100 C6, 5, C7 1 1993-05-04 NE, P Czech Republic Material 170 48.834858 Breclav 1 16.757174 Bulhary 5 100 MJ 2889, BRNM 844459 2 Jihomoravsky holotype 2024-11 LSU, V, LIP France Loiret Jargeau 6 101 PP104712 1 2024-12-12 ITS, LSU, V, LIP France Same 6 101 PV226177 1 2025-01-24 ITS, V, LIP France Jarville-la-Malgrange Genbank Meurthe-et-Moselle 6 101 1