Erioscyphella griseibambusicola
Erioscyphella griseibambusicola H.L. Su & Q. Zhao
Diagnosis – It is characterized by minute, cupulate to globose apothecia, abundant, long, brown hairs with resinous material on the apex.
Index Fungorum number: IF 557880; Facesoffungi number: FoF 12851
Etymology – “grisei” means grey, “bambusicola” means bamboo. The species has grey apothecia occurring on bamboo culm.
Holotype – HKAS 124656
Saprobic on dead bamboo culms. Sexual morph: Apothecia scattered to partly gregarious, superficial, 0.2-0.4 mm in diameter, 0.3-0.5 mm high when dry, cupulate when fresh, globose when dry, shortly stipitate, leathery, externally covered with abundant, long and greyish yellow hairs. Disc concave, surface slightly rough, white to grey. Margin involute, white to grey, clothed with abundant, white to brown hairs. Receptacle cupulate to globose, brown, clothed with abundant, long, greyish yellow hairs entirely. Stipe 0.1-0.2 mm in diameter (including hairs), 0.1-0.2 mm long when dry, cylindric, most solitary, some gregarious with the common base, dark brown, clothed with abundant, long, white to brown hairs. Hairs 60-160 × 2.5-5.0 µm (x̄ = 96 × 3.9 µm, n = 47), cylindric, straight to slightly curved, multiseptate, light brown to dark brown, thick-walled, covered with hyaline granules, obtuse apex crowned with light brown amorphous material, not dissolved with CB/LA. Hymenium 115–140 µm (x̄ = 130 µm, n = 10), concave, surface slightly rough, white to grey. Medullary excipulum 55–100 µm (x̄ = 80 µm, n = 15) thick, hyaline, thin-walled, smooth cells of textura intricata, 2.0–4.5 µm (x̄ = 2.8 µm, n = 50) in diameter. Ectal excipulum 15–35 µm (x̄ = 23 µm, n = 22) thick, thick-walled, smooth, brownish cells of textura porrecta, 5.5–18.5 × 3.0–6.5 µm (x̄ = 10.5 × 4.3 µm, n = 51). Paraphyses 100–150 × 2.0–3.0 µm (x̄ = 123 × 2.5 µm, n = 50), longer than asci, filiform, straight, septate on the base, hyaline, thin-walled, slightly rough, with slightly acute apex. Asci (95–)100–120 × 10–15 µm (x̄ = 107 × 12 µm, n = 47), 8-spored, clavate, straight to slightly curved, inoperculate, hyaline, unitunicate, wall apically thickened, laterally relatively thin, slightly rough, with an apical, amyloid pore and slightly tapered ends, croziers absent at the basal septa, blue in MLZ or IKI with and without 3% KOH pretreatment. Ascospores (90/14/2) (57.0–)59.0–76.0(–81.5) × (2.0–)2.5–4.0 µm, (x̄ = 67.0 × 2.9 µm, Q = 16.5–31.7, Q = 23.43±3.45), fascicled, filiform, 7–8-septate, thin-walled, hyaline, and slightly smooth when mature, rough with some oil guttules in immature, with taper, obtuse ends. Asexual morph: Unknown.
Material examined – China, Yunnan, Ailao Mountain, alt. 2460 m, on the fallen bamboo culm, 29 August 2021, H.L. Su, SHL70 (HKAS 124656, holotype); ibid., alt. 2464 m, on the fallen bamboo culm, 28 August 2021, H.L. Su, SHL44 (HKAS 124657, paratype).
Notes – The new species bears slight similarities to Erioscyphella papillaris and E. otanii in having minute apothecia and white to light yellow hymenium, while the latter two reference species are phylogenetically distant from the former. However, the three species exhibit morphological differences as well. Erioscyphella griseibambusicola has grey to greyish yellow apothecia, and light brown to dark brown hairs with the apex crowned with light brown amorphous material. However, E. papillaris has white to lemon yellow apothecia, hyaline hairs with hyaline amorphous material and lacks any crystals or resinous matters. Furthermore, E. griseibambusicola has longer hairs, asci, ascospores, and paraphyses than those of E. papillaris (Table 3). Erioscyphella otanii has pure white to pale yellow apothecia, hyaline, shorter hairs, asci, ascospores, and paraphyses compared to E. griseibambusicola (Table 3). Furthermore, E. griseibambusicola is found on the dead bamboo culm, while the other two species are on fallen leaves of bamboo.
Erioscyphella griseibambusicola (HKAS 124656, holotype). a Habitat. b Fresh apothecia on host surface. c–f Dried apothecia. g Vertical section of an apothecium. h Section of the excipulum. i Hairs. j Paraphyses. k An immature ascus and paraphyses. l, m Asci. n Apex of an ascus in MLZ. o Base of an ascus. p Ascospores. Scale bars: b = 2 mm, c = 1 mm, d = 500 µm, e–g = 200 µm, h–i = 20 µm, j–m = 50 µm, n = 5 µm, o = 10 µm, p = 20 µm.
Reference:
Su HL, Chethana KWT, Zeng M, Zhao Q 2023 – Two new species of Erioscyphella (Lachnaceae) from southwestern China. Current Research in Environmental & Applied Mycology (Journal of Fungal Biology) 13(1), 16–33, Doi 10.5943/cream/13/1/2
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