Inocybe leucophaea Eyssart. & Buyck 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
Inocybaceae
Inocybe
Inocybe leucophaea

description: 116. Inocybe leucophaea Eyssart. & Buyck, sp. nov.
(Figs 11; 12)
DIAGNOSIS. — Differs from Inocybe subclavata in its larger spores with less prominent knobs, its distinctly thicker-walled cystidia and its association with trees from the African miombo woodland.
HOLOTYPE. — Zambia. Near Lusaka, gregarious, in strongly degraded miombo woodland, 08.II.1996, Eyssartier 96095 (holo-, P [PC0088783]).
INDEX FUNGORUM. — IF558793.
GENBANK. — EU569860 (LSU), EU569859 (rpb 1).
ETYMOLOGY. — Named after the general colors of the basidiomata, from ancient greek leukos, “white”, and phaios, “dusky”.
DESCRIPTION
Pileus
Measuring (8)12-20(30) mm in diam., conical obtuse with inflexed margin or conico-campanulate, often with a broad umbo topped by another very small and obtuse one, sometimes totally absent, the young very pale by a white veil, sometimes greyish, then the margin becomes beige, slightly ochraceous but always pale, even in the young stages, soon fibrillose slightly rimose towards the margin, which is a little bit incised and paler by the veil.
Lamellae
Quite close, (1.5) 2-3 mm broad, emarginate, white in the young stages then ocraceous greyish, ocraceous beige, quite pale.
Stipe
35-60(65) × 3-4(6) mm, bulbous, marginate, whitish, pale beige to straw-yellow, pruinose.
Flesh
Pale, whitish.
Odor
Slightly honey-like.
Taste
Mild, slightly herbaceous.
Spores
Nodulose, with (6)7-8(9) obtuse swellings, (7)8-9(10.5)× (5)6- 7(8) µm, few spores quite larger, up to 12-14 × 8-9 µm (possibly from 2-spored basidia?).
Basidia
4-spored, clavate, (18)20-25 × 8-9 µm.
Paracystidia
Clavate, small, 15-20 × 8-9 (10) µm.
Cheilocystidia
Pyriform with a very obtuse base, or broadly lageniform, with very thickened walls, up to 4 (-4.5) µm, very slightly coloured in 10 % ammonia.
Pleurocystidia
Similar to cheilocystidia.
Pileipellis
A cutis of cylindrical hyphae, (3)5-7(10) µm broad, without clear pigment, very slightly incrusted.
Clamp connections
Present in all parts.
NOTES
Inocybe leucophaea sp. nov. was part of the multigene phylogenetic analyses published by Matheny et al. (2009) where it was part of a highly supported African clade together with two other species collected by us: I. glaucodisca Buyck & Eyssart. (Buyck & Eyssartier 1999) for which the LSU sequence is 98.2% similar for 100 % coverage, while it was placed sister to I. densifolia nom. prov. (similarity 99 % for 100 % coverage). This African clade was placed sister with high support to a neotropical clade composed of I. antillana Pegler and I. xerophytica Pegler (see Pegler 1983). The phylogenetic analyses based on LSU sequences in Horak et al. (2015) still grouped with high support I. glaucodisca, I. densifolia nom. prov. and I. leucophaea sp. nov., but lacked support for the deeper nodes that suggested close affinities with other Inocybe from the African miombo woodlands such as I. conspicuospora Buyck & Eyssart or the still undescribed I. velatorimosa nom. prov. Inocybe subclavata (E. Horak) Garrido closely resembles Inocybe leucophaea sp. nov., particularly in general habit, colour and presence of an abundant veil, but differs in its marginate stipe, and the smaller spores with less numerous and more prominent knobs, its distinctly thinnerwalled cystidia and the association with Nothofagus in New Zealand (Horak 2018).
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 page 36, DOI: 10.5252/cryptogamie-mycologie2022v43a2, http://zenodo.org/record/7828891