Inocybe hebes Eyssart. & Buyck, 2022

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, Cryptogamie, Mycologie 20 (2), pp. 23-61 : 32-34

114. Inocybe hebes Eyssart. & Buyck , sp. nov.

( Figs 7 ; 8 )

DIAGNOSIS. — Resembles Inosperma curvipes , but differs from it in its association with trees from the African miombo woodland, its more vivid brown colours, non spermatic smell, and lageniform often subcapitate cystidia.

HOLOTYPE. — Zambia. Near Lusaka, gregarious in miombo woodland, 10.II.1996, Eyssartier 96110, (holo-, P[PC0088772]).

INDEX FUNGORUM. — IF558792.

GENBANK. — JN974997 (LSU).

ETYMOLOGY. — Named after the general form of the cap, from the latin adjective hebes , “blunt, obtuse”.

DESCRIPTION

Pileus

Measuring12-20(25) mm in diam., obtuse conico-campanulate then plano-convex to plane, ochraceous-blond, ochraceous beige to dull brown, sometimes darker at the top, fibrillose to coarsely fibrillose, sometimes with erected squamules around the centre.

Lamellae

Subhorizontal, not very close to quite distant, (1.5)2-3(4) mm broad, emarginate, pale beige then ochraceous brown, with very slightly pruinose edges.

Stipe

20-35(40) × 2-3 mm, slightly broadened at the base up to 5-7 mm, seldom cylindrical but never bulbous, pale beige sometimes with pinkish tinges at the tip, then brownish to dirty brown in the older stages, not pruinose or very finely just under the lamellae.

Flesh

Pale,sometimes with pinkish tinges in- the upper part of the stipe.

Odor

Particular, of fresh bread or brioche, sometimes honey-like.

Taste

Mild.

Spores

Nodulose, with 5-6(7) obtuse swellings, (7)8-9(10) × (5.5) 6-7(7.5) µm.

Paracystidia

Clavate, small, 15-25 × 8-10 µm.

Cheilocystidia

Lageniform often subcapitate, without or with few crystals, (40)45-55(60) × (10)13-15(18)µm, with thickened walls up to 2-3 µm, hyaline in 10% ammonia.

Pleurocystidia

Cheilocystidia-like, but slightly bigger, up to 75(90)µm long.

Pileipellis

A cutis of relatively broad hyphae, (5)8-12(15) µm. Pigment incrusting.

Clamp-connections

Present in all parts.

NOTES

The LSU sequence of our species was part of phylogenetic analyses presented in Ryberg & Matheny (2012) but its systematic position was not discussed. As far as we are aware, it is not mentioned in any other publication so far. nBLAST of this sequence does not suggest high similarities with other African species, although the most similar sequence (96.7% for 99 % coverage) is obtained from another Inocybe from African miombo woodlands: our still unpublished I. subfuscescentipes nom. prov. Inocybe curvipes P. Karst. , a species described from Finland but now widely distributed throughout the world ( Bougher & Matheny 2011), resembles it in a number of ways, notably in its browning stipe and spore shape, but has more vivid brown colours, spermatic smell, cylindrical or slightly swollen stipe and larger cystidia, broadly fusiform and noticeably tapered towards the apex; in addition, Inocybe curvipes associates with introduced Quercus or Pinus radiata , and also possibly Salix .

Figures

FIG. 7. — Inocybe hebes Eyssart. & Buyck, sp. nov. Photo: B. Buyck.

FIG. 8. — Inocybe hebes Eyssart. & Buyck, sp. nov. (holotype): A, fruiting bodies; B, basidia; C, cystidia; D, marginal cells of the gill edge; E, spores; F, pileipellis in section (detail). Scale bars: A, 1 cm; B-E, 10 μm. Drawings by G. Eyssartier.