Inosperma africanum Aignon , Yorou & Ryberg, 2021

Aignon, Hyppolite L., Jabeen, Sana, Naseer, Arooj, Yorou, Nourou S. & Ryberg, Martin, 2021, Three new species of Inosperma (Agaricales, Inocybaceae) from Tropical Africa, MycoKeys 77, pp. 97-116 : 97

1. Inosperma africanum Aignon, Yorou & Ryberg sp. nov. Figs 2a , 3

Diagnosis.

Inosperma africanum is distinct from all species of Inosperma and truly outstanding by its vinaceous to red colouration.

Type.

Holotype. Benin, Collines Region, Kilibo: 8°32.74'N, 2°40.42'E, on soil in Forest Reserve of Toui-Kilibo in Woodland dominated by Isoberlina doka and I. tomentosa , 11 August 2017, leg. AIGNON L.H, Voucher (HLA0383) GenBank accession: ITS (MN096193); LSU (MN097885) and RPB2 (MT770739).

Description.

Pileus 8.5-15 mm diam., convex to plane, uniform, surface fibrillose, vinaceous to red (8F8), surface rimose, dry. Lamellae moderately close, subventricose, narrowly attached, 0.5-1 mm deep; vinaceous, sometimes light pinkish (8F8), edges fimbriate, vinaceous (8B8). Stipe 15-23 × 0.5-1 mm, cylindrical, central, fibrillose, swollen, bulbous at the base, veil none with the lower two thirds pinkish-white (8A3) and the upper third light vinaceous (8A5). Odour and taste not distinctive. Basidiospores (6.2) 8-10 (10.3) × (3.8) 4-6.8 (7) μm, avl × avw = 8.3 × 5.3 μm, Q = (1.2) 1.1-2.1 (2.2), avQ = 1.6, smooth, (sub) globose to cylindrical, sometimes ellipsoid. Basidia 18-47 × 7-10 μm, clavate, 3-4 sterigmate, hyaline. Cheilocystidia 22-54 × 8-12 μm, cylindrical to clavate, thin-walled, hyaline. Pleurocystidia absent. Pileipellis a cutis with cylindrical, smooth, thin-walled hyphae, 6-20 μm diam., negative reaction of pileus surface in KOH. Stipitipellis a cutis radially arranged, hyphae 5-13 μm diam., parallel, sometimes septate, filamentous. Caulocystidia 22-63 × 8-13 μm, fusiform sometimes utriform, observed on the upper third of the stipe. Clamp connections present.

Distribution.

Currently known from Benin, Burkina Faso, Guinea, Ivory Coast, Togo.

Ecology.

Scattered in Tropical Woodlands dominated by Isoberlinia doka and I. tomentosa or gallery forests dominated by Berlina grandiflora .

Etymology.

Inosperma africanum , referring to the distribution in Africa.

Additional specimens examined.

Benin, Borgou Province, N’dali Region: 8°32.74'N, 2°40.42'E, on soil in Woodland dominated by Isoberlina doka , 30 August 2017 in Forest Reserve of N’dali, Leg. Aïgnon HL., Voucher (HLA0461) GenBank accession: ITS (MT534297) and LSU (MT560732). Benin, Borgou Province, Tchaorou Region: 9°15.28'N, 2°43.38'E, on soil in forest of Okpara in woodland dominated by I. doka , 7 June 2017, leg. Aïgnon HL., Voucher (HLA0353) GenBank accession: ITS (MT534299). Benin, Borgou Province, N’dali Region: 8°45.73'N, 2°19.93'E, on soil in Woodland dominated by Isoberlina doka , 8 July 2013, leg. Ryberg M., Voucher (MR00361). Benin, Province, Boukoumbe, North Region: 10°14.45'N, 1°7.00'E, on soil in Woodland dominated by Isoberlina doka , 25 July 2020 in Koussoukouangou waterfall, Leg. Aïgnon HL., Voucher (HLA0736). Burkina Faso, Kenedougou Province, Toussiambandougou Region: 10°55.86'N, 4°51.83'W, on soil in gallery forest dominated by Berlina grandiflora , 27 June 2018, leg. Aïgnon HL., Voucher (HLA0353). Ivory Coast, Kekrekouakoukro Province, Bouake, Gbeke Region: 7°40.52'N, 4°54.48'W, on soil in Woodland dominated by B. grandiflora , 11 July 2018, leg. Aïgnon HL., Voucher (HLA0562). Guinea, Faranah Province, Upper Guinea Region, National Park of Haut Niger: 10°30.76'N, 9°57.68'W, on soil in Woodland dominated by B. grandiflora , 4 July 2018, leg. Aïgnon HL., Voucher (HLA0532). Togo, Central Region, Prefecture of Assoli, on the road between Bafilo and Aledjo: 09°20.38'N, 1°14.44'E in Woodlands dominated by I. tomentosa , 7 August 2013, leg. Martin Ryberg, Voucher (MR00387) GenBank accession: ITS (MN096189); LSU (MN097881), RPB2 (MT770739).

Notes.

Inosperma africanum is nested in Inosperma and indicated as sister to the rest of the genus in our phylogenetic analyses and is very distinct by its small size and a vinaceous to red pileus. It has a wide distribution in West Africa.

Figures

Figure 2. Macromorphology of: A Inosperma africanum (HLA 0383) B Inosperma bulbomarginatum (MR 00357) C, D Inosperma flavobrunneum (HLA 0367). Scale bar: 1 cm.

Figure 3. Microscopic structures of Inosperma africanum (HLA 0383) A basidiospores B basidia C cheilocystidia D caulocystidia E pileipellis F stipitipellis. Scale bars: 3 μm (A); 5 μm (B); 10 μm (C-F).