Inocybe media 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 : 34-36

115. Inocybe media Eyssart. & Buyck , sp. nov.

( Figs 9 ; 10 )

DIAGNOSIS. — Differs from other species of the asterospora - pileosulcata clade in its smooth or irregularly angled spores, and its habitat corresponding to the African miombo woodlands.

HOLOTYPE. — Zambia. Along Luanshya-Ibenga road, gregarious in very young miombo woodland with Uapaca pilosa and U. kirkiana , 3.II.1996, Eyssartier 96083, BB 96.285 (holo-, P [ PC0088770 ]).

INDEX FUNGORUM. — IF578795.

GENBANK. — EU600884 (LSU).

ETYMOLOGY. — Name formed by reference to the shape of the spores, intermediate between the smooth and the gibbous type, form the latin media , “intermediate, which is between two”.

DESCRIPTION

Pileus

Measuring 15-20 mm in diam., conico-campanulate with a large obtuse umbo that is pruinose from a white veil, clear ochraceous beige, pale beige brown with a reddish brown tinge or honey, even at the centre, towards the margin fibrillose, sometimes a little bit rimose.

Lamellae

Ascendant, 2-3 mm broad, emarginate, quite close, a pale beige ochraceous with white edges.

Stipe

30-40 × 2-3 mm, sometimes flexuous, bulbous marginate (up to 4.5-6 mm), pale beige, white beige, pruinose lenghtwise.

Context

White in the pileus and the base of the stipe, subconcolorous in the stipe.

Smell

Very faint.

Taste

A little bit herbaceous.

Spores

Of particular shape, smooth or irregularly angled with few inconspicuous nodules, intermediate between the smooth and the gibbose types, (8)9-12(13) × (5)5.5-6.5(7) µm.

Basidia

Clavate, 4(2)-spored, 25-30 × 8-10 µm.

Paracystidia

Clavate, (13)15-20(25) × 7-8(10) µm.

Hymenial cystidia

Very similar on sides and edge of gills, lageniform to broadly lageniform, (45)50-60(65) × 15-20(25) µm, with very thickened walls, (2)3-4 µm, up to 5 µm in the upper part; colourless or almost so in 10 % ammonia.

Pileipellis

A cutis of subcylindrical or slightly inflated hyphae, 3-8 µm broad, broadened to 12-15 µm towards the underlying layer. Pigment brown yellowish, distinctly incrusting.

Clamp connections

Present in all parts.

NOTES

Although only a LSU sequence has been published for Inocybe media sp. nov., the species was part of multigene phylogenetic analyses ( Matheny et al. 2009) where it is placed in a terminal clade with I. pileosulcata E. Horak, Matheny & Desjardin from Thailand, and with the European I. napipes J. E. Lange ( Horak et al. 2015) . Inocybe pileosulcata is associated with Dipterocarpus and is morphologically similar to the European Inocybe asterospora Quél. , with which it was once confused ( Horak 1979) and both species probably belongs to the same clade. All the abovementioned Inocybe have clearly gibbose spores with prominent knobs: Inocybe media sp. nov. is thus distinguished by its singular spores, of intermediate form between the smooth and gibbose type.

Figures

FIG. 9. — Inocybe media Eyssart. & Buyck, sp. nov. Photo: B. Buyck.

FIG. 10. — Inocybe media 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.