Inocybe humilis (J. Favre & E. Horak) Esteve-Rav. & Vila, Revista Catalana de Micologia

Esteve-Raventós, Fernando, Pancorbo, Fermín, Larsson, Ellen, Turégano, Yolanda, Moreno, Gabriel & Altés, Alberto, 2022, Inocybe vaurasii (Agaricales, Inocybaceae), a new species of the I. xanthomelas group and similar European species with asteriform spores, Phytotaxa 566 (2), pp. 171-188 : 180-181

Inocybe humilis (J. Favre & E. Horak) Esteve-Rav. & Vila, Revista Catalana de Micologia 21: 192 (1998). Figs. 4a, d

≡ Astrosporina humilis J. Favre & E. Horak in Horak, Arctic and Alpine Mycology 2: 231 (1987)

Misapplied: Inocybe humilis J. Favre, Ergebnisse des Wissenschaftlichen Untersuchungen des Schweizerischen Nationalparks 6: 480, 587 (1960) -inv. art. 40.1-

Studied material: holotype of I. humilis . Figs. 5a, b :— SWITZERLAND, God God vers 1800 m prés de S-chanf, Hte Engadine , sur la terre nue graveleuse d’un chemin, foret de mélèzes, d’épicéas, d’aroles ( Pinus cembra ), 5 September 1956, J. Favre, G00126386 ( G!), Nº Collector: Z.S. 583. GenBank: ITS ON227435 .

Basidiospores star-shaped ( Inocybe asterospora -like), ochraceous, provided with numerous knobs (8–12), 1.2–2.5 µm high, subisodiametric, (9–)9.1– 9.9 –10.7(–11) × (7–)7– 7.5 –8(–8) µm. Q = (1.2–)1.2– 1.3 –1.4(–1.4) (12 spores). Basidia hyaline, claviform, 4-spored. Gill edge heterogeneous. Cheilocystidia (45–)45–50.3–55(–55) × (14–)14.7– 17.6–19.7(–20) µm (6 cystidia), abundant, hyaline or showing a golden intracellular pigment, crystalliferous at apex, mostly lageniform, sometimes shortly pedicellate, with pale yellow reaction to ammonia; paracystidia clavate, hyalin. Pleurocystidia numerous, similar to cheilocystidia, (44.1–)52.6– 67.9 –83.7(–94.8) × (13.7–)15.5– 17.7 –20.3(–22.2) µm, Q = (2.46–)2.96– 3.8 –5.22(–6.08) (6 cystidia), hyaline or showing a golden-brown intracellular pigment, thick-walled (2–3) µm. Trama of stipe quite yellow, just darkening to brownish yellow. Caulocystidia abundant, lageniform to subfusiform (31.5–)32.5– 52.2 –63(–65) × (13–)14.4– 18 –22.2(–23) µm. Q = (1.87–)1.95– 2.9 –3.9(–4.01) (11 cystidia), weakly crystalliferous, present from the apical part to the base of the stipe in tufts, where they appear mixed with cylindrical caulocystidiod hairs and with numerous hyaline clavate paracaulocystidia, thick-walled. Clamps present.

Additional collections examined of Inocybe humilis :— SPAIN, Girona, Ulldeter, Setcases (Ripolles), UTM 4384697, 2300 m asl., in Salix herbacea and S. retusa , 14 August 1997, J. Vila, AH 23498!, duplicate in JVG970814- 14, GenBank: ITS-LSU ON 259052 ; Madrid, Somosierra, Dehesa Boyal, under B. pendula , Corylus avellana , 13 July 1988, G. Moreno, F. Esteve-Raventós, AH 46520!; ibidem, under B. pendula , Q. petrea , S. atrocinerea , 1 September 2001, M. Villarreal, F. Esteve-Raventós, AH 26954!, GenBank: KJ938773 (as I. xanthomelas ); ibidem, La Hiruela, under Betula pendula , 14 July 2002, J. C Campos, J. P. Campos, AH 29895!, GenBank: KJ938774 (as I. xanthomelas ); ibidem, Rascafría, Arroyo de la Angostura, 40.835642, -3.897870, 1328 m, under Pinus sylvestris , Betula alba , Salix sp. , 5 August 2007, F. Pancorbo, AH 56428!; ibidem, on the margin of a peat bog under B. alba , P. sylvestris , 27 June 2009, F. Pancorbo, AH 56429!; ibidem, 2 July 2011, F. Pancorbo, AH 45142!, GenBank: ITS-LSU ON 259050 ; ibidem, El Brezal, 40,858 859, -3,909738, 1236 m asl., on the margin of a peat bog under B. alba , P. sylvestris , 6 August 2011, F. Pancorbo, AH 56430!; ibidem, Arroyo de La Angostura, 40.83564298, -3.89787044, 1340 m asl., On the margin of a peat bog under B. alba , P. sylvestris , Salix sp. , 23 June 2012, F. Pancorbo, AH 45147!; ibidem, 30 June 2012, F. Pancorbo, AH 45144!, GenBank: ITS-LSU ON 259051 ; ibidem, 7 July 2013, F. Pancorbo, AH 40430!, GenBank: KJ938775 (as I. xanthomelas ); ibidem, 14 July 2013, F. Pancorbo, AH 56424!; ibidem, 14 July 2013, F. Pancorbo, AH 56425!; ibidem, 1 August 2013, F. Pancorbo, AH 56426!; ibidem, 3 July 2015, F. Pancorbo, AH 56427!; ibidem, 14 August 2015, F. Pancorbo, AH 47700!; ibidem, Arroyo Aguilón, 40.877638, -3.877161, 1180 m asl., on the margin of a brooklet in a Quercus pyrenaica forest, on acidic soil, 10 July 2017, F. Pancorbo, AH 56431!; ibidem, 26 September 2017, F. Pancorbo, AH 48192!, GenBank: ITS-LSU ON 259053 ; ibidem, Arroyo de La Angostura, 40.83611, -3.89667, 1337 m asl., on the margin of a peat bog under B. alba , P. sylvestris , 30 June 2018, F. Pancorbo, AH 48220!; ibidem, 24 June 2020, F. Pancorbo, AH 56356!; ibidem, 24 June 2020, F. Pancorbo, AH 56357!; ibidem, 3 August 2020, F. Pancorbo, AH 56364!, GenBank: ITS-LSU ON 263577 ; ibidem, 13 August 2020, F. Pancorbo, AH 56370!; ibidem, 10 July 2021, F. Pancorbo, AH 56417!; ibidem, 21 August 2021, F. Pancorbo, AH 56423!, GenBank: ITS ON 263163 . SWEDEN, Västergötland, Alingsås, Nolhagaparken, under Fagus and Quercus , 15 August 2004 ( GB!), GenBank AM882718 ; ibidem, under Fagus and Quercus , 8 September 2015, E. Larsson 143-15 ( GB!); Jämtland, Bräcke, Bräcke kyrkogård, under Pinus sylvestris , 27 August 2018, E. Larsson 226-18 ( GB!).

Figures

FIGURE 4. Fresh basidiomata in situ. a, d. Inocybe humilis AH 56423. b, e. Inocybe xanthomelas AH 47646. c, f. Inocybe subrimosa AH 44474. Scale bar: 20 mm. Photos: F. Pancorbo.

FIGURE 5. Vouchers and SEM spores of types. a, b. Inocybe humilis J. Favre, G00126386, Z.S. 583. Holotype. c, d. Inocybe subrimosa (P. Karst.) Sacc. P.A.K. No. 3223 (H). Lectotype. e, f. Inocybe xanthomelas Boursier & Kühner, « Mail var. affinis » G00127626. Lectotype. Scale bar: 2 µm = b, d, f; 10 mm = a, c, e. Photos: G. Moreno.