Dermoloma aff. fusipes, Arnolds & Harries, 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 aff. fusipes

Figs 27 c , 29

Description.

Pileus 25–26 mm; convex, soon expanding to plane, indistinctly umbonate; margin not striate, recurved when old, when dry radially cracking; surface smooth, slightly rough near center, not hygrophanous; color near margin grayish brown (more reddish than 5 D 3), near center dark brown (6 F 3). Stipe 24–35 × 4.5–5 mm; cylindrical, narrowed towards the base, flexuous; surface finely longitudinally striate, pruinose near lamellae, fibrillose-granulose towards the base; color near lamellae ochraceous-gray (5 B 2) to almost white, near the base brownish gray (5 C 2) with slightly more brown granules. Lamellae L = 25–36, l = 1–3; 4.5 mm wide; adnate-emarginate and decurrent with tooth; color ochraceous-gray (5 B 2) to almost white towards edges; edges entire. Context fragile; odor farinaceous.

Spores (5 –) 5.2–5.6 – 5.9 (– 6.2) × (3.3 –) 3.5–3.8 – 4.1 (– 4.3) μm; ellipsoid to narrowly ellipsoid, Q = (1.32 –) 1.38–1.47 – 1.55 (– 1.61); walls inamyloid, often thick-walled and dextrinoid; hilar appendage ca. 0.5–1.5 μm long. Basidia (24 –) 26.5–28.5 – 30.6 (– 32) × 7–7.6 – 8 (– 9) μm; clavate; mainly with 4 sterigmata, occasionally with 2 sterigmata. Basidioles first cylindrical, then clavate, ca. 3–7 μm wide. Marginal cells not differentiated and similar to basidioles, mainly clavate. Pileipellis 68–78 μm deep; suprapellis 45–58 μm deep, of two to four layers of inflated, densely arranged cells; subpellis hardly defined, 12–25 μm deep, of densely packed, mainly horizontally oriented, puzzled, 3–12 μm wide hyphae, gradually passing to horizontally oriented hyphae in trama; hyphal terminations with brownish yellow parietal pigments, near septa of terminal cells and in subpellis also indistinctly incrusted but without darker pigments, near pileus center pigments in subpellis more apparently incrusted and darker, thin-walled or with slightly thickened walls up to 0.5 μm, in subpellis thick-walled up to 1 μm. Terminal cells near pileus margin (26 –) 34–44.5 – 55 (– 66) × (10 –) 15–19.3 – 23.5 (– 26) μm; usually sphaeropedunculate, obpyriform or clavate; subterminal cells usually equally wide and inflated, ventricose-fusiform, rarely narrowly cylindrical, often branched and irregularly lobate, occasionally nodulose and with lateral projections. Terminal cells near pileus center (30 –) 37–46.3 – 55.5 (– 71) × (10 –) 15.8–20.7 – 25.5 (– 30) μm; more frequently narrow and subcylindrical, more irregularly lobate and more frequently branched; subterminal cells more frequently narrowly cylindrical and branched, often flexuous and lobate, occasionally also inflated. Caulocystidia (12 –) 21.5–30 – 37.5 (– 48.5) × (3.5 –) 4.5–5.1 – 6 (– 6.5) μm; cylindrical or clavate, usually flexuous, often clustered in loose, small or large, ascending fascicules, sometimes individual and repent; thin-walled or with slightly thickened walls near septa, with yellowish parietal pigments, often with abundant crystalline or granulose yellow incrustations. Clamp connections present.

Distribution and ecology.

Known from one locality in Wales ( United Kingdom).

Material studied.

United Kingdom • Wales, Powis Castle gardens , coord. 52°38'58"N, 03°09'34"E, terrestrial in lawn, 22 Oct 2014, S. Adamčík ( SAV F-4371 ) .

Notes.

This taxon is morphologically and phylogenetically very close to D. fusipes , but we had only one sample with good DNA quality. As mentioned above, sequences of French (CLF 04 / 249) and Croatian (CLF 01 / 2851) samples were of poor quality but clustered with this taxon. Dermoloma aff. fusipes was recognized by Sánchez-García et al. (2021) as “ Dermoloma sp. 5 ”.

Figures

Figure 27. Basidiomata of Dermoloma in field appearance. a Dermoloma fusipes (SAV F- 4376), photo D. Harries; b Dermoloma fusipes (SAV F- 4377, holotype), photo D. Harries; c Dermoloma aff. fusipes (SAV F- 4371), photo D. Harries; d Dermoloma griseobasale (SAV F- 4723, holotype), photo S. Jančovičová; e Dermoloma griseobasale [BBF (GC 10110201)], photo G. Corriol; f Dermoloma griseobasale (CNF 5 / 287), photo A. Mešić. Scale bar: 10 mm.

Figure 29. Dermoloma aff. fusipes (SAV F- 4371), 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.