Dermoloma carpathicum Adamčíková & Jančovič., 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 carpathicum Adamčíková & Jančovič. sp. nov.

Figs 15 c, d , 18

Etymology.

The majority of the collections originate from the Carpathian Mts.

Holotype.

Romania • Vladeasa Mts., pasture 1.2 km N of Belis , elev. 1060–1085 m, coord. 46°41'47"N, 23°02'10"E, terrestrial, 5 Oct 2014, S. Adamčík ( SAV F-4268 ).

Diagnosis.

European species; basidiomata small to moderately large; pileus hygrophanous and indistinctly striate near the margin; lamellae ochraceous-gray to almost white; stipe without darker squamules or fibrils; spores inamyloid and on average wider than 3.6 µm wide and / or Q <1.4.

Pileus (6 –) 10–41 mm; convex to plano-convex, soon expanding to plane, indistinctly umbonate, rarely broadly obtusely conical, rarely lobate; margin usually not striate, sometimes indistinctly translucently striate, recurved when old, when dry radially cracking; surface usually smooth near margin and rugulose or rough near center, sometimes completely smooth, rarely rough near margin and smooth near center or completely rough and rugulose, hygrophanous; color when young dark brown (6 F 3, 6 F 4,7E 3, 7 F 4), when mature gradually paler towards margin, brown (5 E 4,6E 4), light brown (5 D 4), grayish brown (5 D 3,6E 3), brownish ochraceous (5 C 3, 5 C 4), brownish gray (5 C 2), grayish ochraceous (5 B 3) to ochraceous-gray (5 B 2), near center dark brown (5 F 4, 6 F 3, 6 F 4, 6 F 5, 7 F 4, 7 F 5), brown (5 E 4,5E 5,6E 4,6E 6) to grayish brown (5 D 3,5E 3, 6 D 3,6E 3). Stipe (14 –) 18–46 (– 48) × 1–5 (– 7) mm; cylindrical, rarely narrowly fusiform, usually narrowed towards the base, usually flexuous; surface finely longitudinally striate, finely pruinose or granulose near lamellae, towards the base finely fibrillose or squamulose; color near lamellae paler ochraceous-gray (5 B 2) to almost white, towards the base brownish gray (5 C 2, 6 C 2), brownish ochraceous (5 C 3), grayish brown (6 D 3,6E 3), brown (6 E 4) to dark brown (6 F 3, 6 F 4), often with darker fibrils or squamules on paler background. Lamellae L = (18 –) 20–34, l = (0 –) 1–3 (– 7); 2–7 mm wide; adnate-emarginate and decurrent with tooth; color ochraceous-gray (5 B 2) to almost white; edges entire or slightly irregular. Context when young compact, later fragile; odor farinaceous.

Spores (4.5 –) 4.8–5.5 – 6.2 (– 8) × (3.2 –) 3.6–4 – 4.6 (– 5.6) μm; broadly ellipsoid to ellipsoid, Q = (1.16 –) 1.31–1.40 – 1.49 (– 1.74); walls inamyloid, often dextrinoid; hilar appendage ca. 0.5–1.5 μm long. Basidia (21 –) 23.5–27.3 – 31 (– 38) × (5.5 –) 6–6.5 – 7 (– 8) μm; clavate; with 4 sterigmata. Basidioles first cylindrical, then clavate, ca. 3.5–6 μm wide. Marginal cells (17 –) 21.5–26.8 – 32 (– 38) × (3.5 –) 5–6.2 – 7.5 (– 10.5) μm; not well-differentiated, clavate, rarely cylindrical, flexuous, sometimes constricted or lobate. Pileipellis 60–70 μm deep; suprapellis 35–50 μm deep, of one or two layers of inflated, densely arranged cells; subpellis well-differentiated, 20–27 μm deep, of densely packed, irregularly oriented, intricate, 3–13 μm wide hyphae, gradually passing to horizontally oriented hyphae in trama; hyphal terminations with brownish parietal pigments, and occasionally with darker brown incrusted pigments near septa of terminal cells and in subpellis, walls thickened especially in subpellis up to 1.2 μm. Terminal cells near pileus margin (20.5 –) 32–42.3 – 53 (– 88) × (8.5 –) 16–20.9 – 26 (– 40) μm; usually obpyriform, sphaeropedunculate or clavate, sometimes ellipsoid or subglobose; subterminal cells usually narrower and branched, flexuous, often lobate or with lateral swellings. Terminal cells near pileus center (14 –) 28–41.5 – 55 (– 82) × (5 –) 14–20.1 – 26 (– 38.5) μm; similar to cells near margin; subterminal cells narrower, cylindrical or ventricose, strongly flexuous or nodulose, usually branched, often with lateral swellings or irregularly lobate, more frequently with brown incrusted pigments. Caulocystidia (15 –) 23.5–35.2 – 46 (– 75) × (2.5 –) 4–5.5 – 7 (– 9) μm; clavate or cylindrical, usually not or only slightly flexuous, often clustered in small ascending fascicules, sometimes individual and repent; usually with slightly thickened walls up to 0.5 μm, often with crystalline or granulose yellow incrustations. Clamp connections present.

Distribution and ecology.

Known from Germany, Romania and Slovakia; in semi-natural grasslands, ancient extensively grazed pastures and meadows.

Additional material studied.

Germany • Baden-Württemberg, Justingen, Schachenheide , coord. 48°24'35"N, 09°40'25"E, terrestrial in semi-natural grassland, 3 Oct 2021, F. Hampe ( SAV F-20895 ) . Romania • Vladeasa Mts., pasture 1.2 km N of Belis , elev. 1060–1085 m, coord. 46°41'47"N, 23°02'10"E, terrestrial, 5 Oct 2014, S. Adamčík ( SAV F-4268 ) ; • ibid., 5 Oct 2014, S. Adamčík ( SAV F-4274 ) ; • ibid., 6 Oct 2014, S. Jančovičová ( SAV F-4304 ) ; • ibid., 7 Oct 2014, S. Adamčík ( SAV F-4336 ) . Slovakia • Javorie Mts., Slatinské Lazy, Jombíkovci, meadow near Matúšov hájik cottage , elev. 460 m, coord. 48°29'47"N, 19°19'08"E, terrestrial, 22 Oct 2020, S. Adamčík ( SAV F-20774 ) ; • Javorníky Mts., 2 km S of Vysoká nad Kysucou, Vrchrieka , elev. 780–810 m, coord. 49°21'42"N, 18°33'05"E, terrestrial in semi-natural grassland, 12 Oct 2012, S. Adamčík ( SAV F-3867 ) ; • Kremnické vrchy Mts., 3 km W of Tajov , elev. 710 m, coord. 48°44'53"N, 19°01'35"E, terrestrial in a extensively grazed pasture, 24 Oct 2020, S. Adamčík ( SAV F-20805 ) ; • ibid., 24 Oct 2020, S. Adamčík ( SAV F-20806 ) ; • Laborecká vrchovina Mts., pasture 1 km NW of Vyšná Jablonka , elev. 400–450 m, coord. 49°09'31"N, 22°06'18"E, terrestrial, 21 Sep 2006, S. Adamčík ( SAV F-4146 ) ; • Malé Karpaty Mts., 0.5 km SE of Sološnica, Božia muka , coord. 48°27'27"N, 17°14'45"E, terrestrial in semi-natural grassland, 12 Jun 2013, V. Kučera ( SAV F-3936 ) ; • Podbeskydská vrchovina Mts., pasture on N margin of the village Mútňanská píla , elev. 780–830 m, coord. 49°28'26"N, 19°17'19"E, terrestrial, 10 Oct 2012, S. Adamčík ( SAV F-3839 ) ; • Štiavnické vrchy Mts., 2.5 km NW of Prenčov, Horné Majere , elev. 420–460 m, coord. 48°22'54"N, 18°54'01"E, terrestrial in semi-natural grassland, 12 Oct 2015, M. Caboň ( SAV F-4743 ) ; • ibid., 12 Oct 2015, M. Caboň ( SAV F-4744 ) ; • Zvolenská kotlina Basin, pasture E of the village Bečov , elev. 400–450 m, coord. 48°38'48"N, 19°14'49"E, terrestrial, 28 Aug 2014, M. Caboň ( SAV F-4247 ) ; • ibid., 28 Aug 2014, S. Adamčík ( SAV F-4248 ) .

Notes.

Dermoloma carpathicum is a member of D. subgenus Dermoloma , section Dermoloma . It is sister to D. simile (Fig. 2 ), with which it shares a very similar field aspect: it reminds of small individuals of D. cuneifolium . Another similar species, D. fuscobrunneum is also a member of D. section Dermoloma , but is not closely related. Morphological delimitation of these three species is problematic, and we recommend to sequence them for verification. In the field D. carpathicum has lamellae and the stipe with brownish or beige colors, sometimes with darker fibrils towards the base of the stipe and a translucently striated pileus margin when wet. The striate pileus margin is a good character to distinguish it from D. cuneifolium , which can sometimes have basidiomata of similar small sizes. Dermoloma carpathicum was included in the phylogenetic study by Sánchez-García et al. (2021) as “ Dermoloma sp. 3 ”. According to our data, this species is common in the Carpathian Mts. (13 collections from Romania and Slovakia), but is rare or absent in Western Europe represented by only a single collection from Germany.

Figures

Figure 2. Phylogram generated by ML analysis based on combined sequence data of ITS, LSU, rpb 1, rpb 2, mcm 7 and tef 1 a showing phylogenetic relationships within genus Dermoloma. ML bootstrap support values greater or equal to 50 % and Bayesian posterior probabilities greater or equal to 0.90 are indicated above or below the nodes. Sequences originating from type collections are labelled in red and bold.

Figure 15. Basidiomata of Dermoloma in field appearance. a Dermoloma bellerianum (SAV F- 4416, epitype), photo D. Harries; b Dermoloma bellerianum [LIP (PAM 05100303)], photo P. - A. Moreau; c Dermoloma carpathicum (SAV F- 4268), photo S. Jančovičová; d Dermoloma carpathicum (SAV F- 20805), photo S. Jančovičová; e Dermoloma compactum (SAV F- 23421), holotype, photo G. Friebes; f, g Dermoloma compactum (SAV F- 20794), photo S. Jančovičová. Scale bar: 10 mm.

Figure 18. Dermoloma carpathicum (SAV F- 3867), 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.