Dermoloma pseudojosserandii Corriol & Hannoire, 2025

Adamčíková, Katarína, Kiran, Munazza, Caboň, Miroslav, Matheny, Brandon P., Sánchez-García, Marisol, Arnolds, Eef, Caboňová, Michaela, Corriol, Gilles, Dima, Bálint, Friebes, Gernot, Griffith, Gareth W., Grootmyers, Django, Harries, David, Karich, Alexander, Mešić, Armin, Mihaljevič, Martin, Moreau, Pierre-Arthur, Pošta, Ana, Shapkin, Vasilii, Tkalčec, Zdenko, Vizzini, Alfredo, Vondrovicová, Lenka, Adamčík, Slavomir & Jančovičová, Soňa, 2025, A phylogenetic and morphological study of the genus Dermoloma (Agaricales, Tricholomataceae) in Europe and North America exposes inefficiency of opportunistic species descriptions, IMA Fungus 16, pp. e 157337-e 157337 : e157337-

Dermoloma pseudojosserandii Corriol & Hannoire sp. nov.

Figs 43 c, d , 46

Etymology.

Species closely related and similar to D. josserandii.

Holotype.

France • Hautes-Pyrénées, Lau-Balagnas, Barderou , grazed grassland, 5 Oct 2017, C. Hannoire CH 17100504 ( BBF, as D. phaeopodium ).

Diagnosis.

European species; basidiomata moderately large, collybioid, pale colored; from similar D. josserandii different in usually more than 30 lamellae near the stipe attachment; stipes with evenly pale colors along entire length; spores <6.5 µm long; marginal cells> 8 µm wide.

Pileus 15–35 mm; convex, soon plane, sometimes lobate; margin indistinctly translucently striate when wet; surface rough, rugulose or pitted, smooth near margin, indistinctly hygrophanous, fading from the center; color when mature near margin grayish brown (5 D 3, 6 D 3) to brown (6 E 4,6E 5), when dry grayish brown (6 C 3) or ochraceous-gray (5 B 2), near center light brown (6 D 4), grayish brown (6 D 3) to brown (6 E 4), when dry grayish ochraceous (5 B 3). Stipe 16–50 × 2.5–5.5 mm; cylindrical, sometimes flexuous, grooved, narrowed towards the base; surface pruinose near lamellae, towards the base longitudinally fibrillose-striate; color yellowish gray (3 B 2) to ochraceous-gray (6 B 2), slightly darker near the base. Lamellae L = 30–37, l = 1–7; 3–7 mm wide; adnate-emarginate and decurrent with tooth; color ochraceous-gray (5 B 2); edges entire or slightly irregular, paler. Context in pileus up to 2.5 mm wide; elastic, later fragile; odor farinaceous.

Spores (5.1 –) 5.8–6.2 – 6.6 (– 7.2) × (3.5 –) 4.1–4.5 – 4.8 (– 5.2) μm; ellipsoid, Q = (1.18 –) 1.3–1.39 – 1.47 (– 1.55); walls amyloid; hilar appendage 0.7–1.5 μm long. Basidia (24 –) 26–29.3 – 32.5 (– 36) × (6 –) 6.5–7.1 – 7.5 (– 9) μm; clavate; with 4 sterigmata. Basidioles first cylindrical, then clavate, ca. 3–7 μm wide. Marginal cells (12 –) 15.5–20.6 – 26 (– 35) × (5 –) 6.5–9.1 – 11.5 (– 13) μm; clavate, obpyriform or ellipsoid, occasionally flexuous, rarely nodulose or lobate, apically obtuse. Pileipellis 48–60 μm deep; suprapellis of one or two (rarely three) layers of inflated, densely arranged cells; subpellis not well-differentiated, hardly 10 μm deep, of densely packed, almost horizontally oriented, 3–10 μm wide hyphae, gradually passing to trama; hyphal terminations with brownish yellow parietal pigments, walls thickened up to 0.5 μm, near septa of terminal cells and in subpellis up to 1 μm. Terminal cells near pileus margin (23 –) 29.5–40.1 – 51 (– 76) × (12 –) 15.5–19.9 – 24.5 (– 33) μm; usually clavate or sphaeropedunculate, rarely obpyriform or ellipsoid, frequently with narrowed, flexuous basal part; subterminal cells frequently branched, usually narrower, irregularly flexuous and lobate, rarely inflated-ventricose. Terminal cells near pileus center (18 –) 28–38.4 – 49 (– 66) × (7 –) 14.5–20.5 – 26.5 (– 45) μm; clavate or obpyriform, occasionally ellipsoid; subterminal cells usually unbranched, cylindrical, occasionally fusiform-ventricose, occasionally nodulose or with lateral swellings. Caulocystidia (13 –) 21–33.5 – 46 (– 63) × 4–5.6 – 7 (– 9) μm; mainly narrowly clavate, rarely cylindrical, sometimes fasciculated, erect or ascending, near lamellae forming continuous trichoderm structure; thin-walled or slightly thickened up to 0.5 μm near septa, with brownish yellow parietal pigments. Clamp connections present.

Distribution and ecology.

Known from three localities in France and Germany; in semi-natural grasslands or deciduous forests, perhaps on calcareous soil, but insufficiently known.

Additional material studied.

France • Hautes-Pyrénées, Ossen , coord. 43°04'05"N, 00°03'36"E, broadleaf eutrophic forest, 23 Sep 2017, G. Corriol GC 17092306 ( BBF, as D. nitens ) . Germany • Baden-Württemberg, Justingen, Schachenheide , coord. 48°24'35"N, 09°40'25"E, terrestrial among grass, 3 Oct 2021, M. Caboň ( SAV F-20908 ) ; • ibid., 3 Oct 2021, S. Adamčík ( SAV F-20912 ) .

Notes.

Dermoloma pseudojosserandii is a member of D. subgenus Amylospora , section Atrobrunnea . It is closely related to D. josserandii . For details about its morphological delimitation see the notes referring to the latter species.

Figures

Figure 43. Basidiomata of Dermoloma in field appearance. a Dermoloma pruinosipes (GLM-F 137757), photo A. Karich; b Dermoloma aff. pruinosipes, (SAV F- 23429), photo G. Friebes; c Dermoloma pseudojosserandii [BBF (CH 17100504)], holotype, photo C. Hannoire; d Dermoloma pseudojosserandii [BBF (GC 17092306)], photo G. Corriol; e Dermoloma rostratum (SAV F- 20811, holotype), photo S. Jančovičová; f Dermoloma rostratum (SAV F- 20817), photo S. Jančovičová. Scale bar: 10 mm.

Figure 46. Dermoloma pseudojosserandii (SAV F- 20908), microscopic elements. a Spores; b caulocystidia; c basidia and basidioles; d marginal cells; e pileipellis elements near the pileus margin; f pileipellis elements near the pileus center. Scale bar: 5 µm for spores and 10 µm for other elements.