Inosperma submaculatum Eyssart. & Buyck, 2021

Buyck, Bart, Eyssartier, Guillaume, Dima, Bálint, Consiglio, Giovanni, Noordeloos, Machiel Evert, Papp, Viktor, Bera, Ishika, Ghosh, Aniket, Rossi, Walter, Leonardi, Marco & Das, Kanad, 2021, Fungal Biodiversity Profiles 101 - 110, Cryptogamie, Mycologie 20 (5), pp. 63-89 : 74-75

106. Inosperma submaculatum Eyssart. & Buyck , sp. nov.

( Figs 10-12)

DIAGNOSIS. — Differs from I. maculatum (Boud.) Matheny & Esteve-Rav. in obtained sequence data that place it in a different, old world African subclade of genus Inosperma with no publicly deposited sequences closer than 90% similarity and no similar described African species known.

INDEX FUNGORUM. — IF558211.

GENBANK. — JQ815428 (nrLSU, paratype), EU600870 (nrLSU, holotype), EU600869 (RPB2, holotype), JQ801417 (nrITS, holotype).

ETYMOLOGY. — Named after its similarity to Inosperma maculatum .

HOLOTYPE. — Zambia. Copperbelt Prov., Chibouli , gregarious on soil in miombo woodland, 1.II.1996, EG96073 (= Buyck 96262, PC[PC0088776]!, holo-).

ADDITIONAL EXAMINED MATERIAL. — Zambia. Copperbelt Prov., Chibouli, gregarious on soil in miombo woodland, 31.I.1996, EG 96062 (= Buyck 96.232, PC[PC0088777]) along Mpongwe-Chibouli road, EG 96067 (= Buyck 96247, PC[PC0088757])

DESCRIPTION

Pileus

(13) 20-30 mm in diam., obtuse conico-campanulate with a involuted margin, seldom plano-convex, chesnut-brown, reddish-brown, like I. maculata Boudier , with a white veil soon missing, in appressed patches at the center, even, sometimes slightly rimose at the margin.

Lamellae

Slightly ascendant or subhorizontal, emarginate, (1.5) 2-3 mm broad, pale beige for a long time, only ochraceous in the oldest stages.

Stipe

(8) 20-35 (40) × (2) 3-5 mm, bulbous marginate, up to 9 (10) mm in the bulb, whitish or pale beige.

Context

White.

Smell

Very slightly honey-like or with a complex herbaceous component.

Spores

(6.5) 7-9 (10) × (4.5) 5-5.5 (6) µm, ellipsoid or slightly reniform, sometimes with a tendency toward subcylindrical, quite pale under the microscope, containing a conspicuous oil drop.

Basidia

Clavate, 4-spored, 25-30 (35) × 8-10 µm, filled with an oily solution.

Hymenial cystidia

Absent

Marginal cells

Variable in size, clavate, (20) 25-40 (50) × 8-12 (15) µm.

Pileipellis

A cutis of cylindrical hyphae, 5-8 µm broad, with finely encrusting pigment on cell walls.