Entoloma aurantioalpinum Armada, Vila, Bellanger, Noordel., Krisai & Dima 2022, sp. nov.
Creators: name: Buyck, Bart
name: Eyssartier, Guillaume
name: Armada, François
name: Corrales, Adriana
name: Hembrom, Manoj Emanuel
name: Rossi, Walter
name: Bellanger, Jean-Michel
name: Das, Kanad
name: Dima, Bálint
name: Ghosh, Aniket
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Entolomataceae
Entoloma
Entoloma aurantioalpinum

description: 112. Entoloma aurantioalpinumArmada, Vila, Bellanger, Noordel., Krisai & Dima, sp. nov.
(Figs 2-4)
DIAGNOSIS. — Macromorphologically similar to Entoloma formosum and E. xanthochroum, two widespread, not strictly alpine species in Europe that occur in lowlands and montane regions, and differ from this E. aurantioalpinum sp. nov. by their more distinctly translucently striate pileus, and furthermore, E. xanthochroum has a coloured lamella edge.
HOLOTYPE. — France. Savoie, Peisey-Nancroix, GR5 route du lac de la Plagne, 2050 m. alt., leg. F. Armada, 25.VIII.2018, holo-, LY (FA 4336).
MYCOBANK. — MB 840117.
GENBANK. — MZ198885 (ITS holotype).
ETYMOLOGY. — From aureus (golden) referring to the color of the pileus, and alpinus for growing in an alpine environment.
ADDITIONAL MATERIAL STUDIED. — France. Savoie, Peisey-Nancroix, GR5 route du lac de la Plagne, 2050 m alt, leg. F. Armada, 23.VIII.2018, LY(FA 4334), ITS[MZ198882].
Italy. Busa de Tasca (Dolomiti), leg. E. Bizio, 23.VIII.2009, Bizio-23082009i2 L [L-0607578], ITS [MZ 468144]; Trentino-Alto Adige, Passo dello Stelvio/Stilfser Joch, near Berghotel Franzenshöhe, alpine grassland with Dryas and Salix spp., 2200 m alt., leg. B. Dima, 30.VII.2018, ELTE (DB 2018-07- 30-4), ITS [MZ 468145].
Austria. Kärnten, Völkermarkt, Eisenkappel: Vellacher Kotschna, 46°22’30”N, 14°32’30”E, mapping grid square 9653/1, alpine grassland, Caricetum firmae, Salix reticulata, calcareous soil, 1500 m s.m., leg. A. Hausknecht, M. E. Noordeloos, M. Meusers, I. Krisai-Greilhuber, and members of the Austrian Mycological Society, 9.IX.1998, WU-Mykol 18644, ITS [MZ 467302] — Niederösterreich, Lilienfeld, St. Aegyd am Neuwalde: Krumbach, Krumbachsattel, 47°48’33.66”N, 15°25’54.85”E, mapping grid square, 8158/4d, altitude 1200 m s.m., alpine grassland, calcareous soil, leg. A. Hausknecht, 6.IX.2006, WU-Mykol 0026678, ITS [MZ 467303].
DESCRIPTION
Pileus
15-25 mm, conico-convex, often truncate or with slight umbilicus, with involute then more or less straight margin, at first uniformly orange-yellow to yellow orange towards margin, not or only weakly translucently striate, finely granulose to subsquamulose all over, particularly at center, glabrescent with age.
Lamellae
Rather crowded, adnate, thin, ventricose, up to 4 mm broad, sometimes a few forked, white then pink, with entire, concolorous edge.
Stipe
29-43 × 2.5-4 mm, slender, cylindrical or with longitudinal groove, very brittle, with subbulbous base, pale orange, contrasting with pileus, polished or with a few longitudinal innate fibrils, with white basal mycelium.
Context
Very thin and brittle, concolorous with surface.
Odour
Indistinct.
Taste
Mild.
Basidiospores
9.5-12 × (6.5)7.3-8.0(8.5) µm, average 10.3-10.8 × 8.0- 8.3 µm, Q = 1.2-1.7, Qav = 1.45, 6-7 angled in side view.
Lamella edge
Heterogeneous to almost sterile, made up of dense clusters of cheilocystidia.
Cheilocystidia
40-65 × 10-14 µm, subcylindrical to clavate or broadly clavate.
Pileipellis
A cutis with transitions to a trichoderm at centre, made up of clavate terminal elements, 10-25 µm wide, with brownish yellow, intracellular pigment.
Clamp-connections
Absent.
Habitat
Terrestrial in alpine heaths amongst either Dryas octopetala or Salix species (S. retusa, S. hastata, S. reticulata), and herbs like Polygonum viviparum, and Alchemilla pentaphyllea, on calcareous bedrock.
Distribution
Rare, but probably widespread in the Alps in Austria, France, and Italy.
NOTES
Entoloma aurantioalpinum sp. nov. belongs to the diversified E. sarcitulum clade (Fig. 2), and clusters with two other so far unnamed alpine species. The macromorphologically similar Entoloma formosum and E. xanthochroum are widespread species in Europe, occurring in lowlands and montane regions, but not strictly alpine. Both differ from E. aurantioalpinum sp. nov. by the more distinctly translucently striate pileus, and furthermore, E. xanthochroum has a coloured lamella edge.
The holotype of E. aurantioalpinum sp. nov. has, in addition to the intracellular pigment, also some slightly incrusted hyphae, but this has not been observed in the other collections of this species. Incrusting pigments are exceptional in Cyanula.
description: Published as part of Buyck, Bart, Eyssartier, Guillaume, Armada, François, Corrales, Adriana, Hembrom, Manoj Emanuel, Rossi, Walter, Bellanger, Jean-Michel, Das, Kanad, Dima, Bálint & Ghosh, Aniket, 2022, Fungal biodiversity profiles 111 - 120, pp. 23-61 in Cryptogamie, Mycologie 20 (2) on pages 26-29, DOI: 10.5252/cryptogamie-mycologie2022v43a2, http://zenodo.org/record/7828891