Erioscyphella alba
Erioscyphella alba Ekanayaka & K.D. Hyde, sp. nov.
Index Fungorum number: IF556292; Facesoffungi number: FoF 05910; Fig. 41.
Etymology – refers to white apothecia
Holotype – MFLU 16-0614
Saprobic on dead stems. Sexual morph: Apothecia 0.8–1 × 0.6–0.9 mm, arising singly or in small groups, stipitate, cupulate, white when fresh. Receptacle concave, disc pale yellow and the margins white when fresh, margins and flanks covered with hairs. Hairs 41.5–59.4 × 2.9–4.5 µm, (50.6 × 3.5 µm, n = 30), on flanks and margins, cylindrical, straight, thin-walled, septate, white to yellowish, densely covered with colorless granules. Ectal excipulum 28–32 µm (x = 31.2 µm, n = 10) in lower flanks, composed of large, thin-walled, hyaline cells of textura prismatica. Medullary excipulum 38–44 µm (x = 42 µm, n = 10) in lower flanks, composed of hyaline cells of textura intricata. Hymenium hyaline. Paraphyses 2.3–3.6 µm wide (x = 2.8 µm, n = 20), numerous, lanceolate, septate. Asci 42.1–48.9 × 4.9–6.3 µm (x = 45.7 × 5.6 µm, n = 30), unitunicate, cylindrical, inoperculate, amyloid, short-stipitate base, arising from croziers. Ascospores 11.1–13.4 × 1.8–2.4 µm ( x = 12.3 × 2.1 µm, n = 40), multi-seriate, fusiform, hyaline, aseptate, row of guttules present, hyaline, smooth, thin-walled, no sheath or appendages, sometimes with refractive inclusions. Asexual morph: Undetermined.
Material examined – Thailand, Chiang Mai Province, Mushroom Research Center, 19 July 2015, A. H. Ekanayaka, HD034 (MFLU 16-0614). GenBank accessions – LSU- MK591990, ITS- MK584965
Notes – Our strain HD034 grouped with Lachnum pteridophyllum with strong statistical support of 85% (Fig. 35). The ITS data of our collection is similar to that of Erioscyphella fusiforme (MFLU 15-0230) (460/495-93% with 2 gaps) and to Lachnum pteridophyllum (strain 3155) (445/487-91% with 4 gaps). The LSU data of our collection is similar to Lachnum abnorme (KUS-F52080) (791/801-99% with no gaps). Erioscyphella alba is similar to Lachnum pteridophyllum, but differs in having white apothecia covered with white hairs, slightly smaller asci and ascospores (Spooner 1987). Erioscyphella fusiforme is similar E. alba by having white apothecia covered with white hairs, but differs in having larger ascospores and filiform paraphyses (Hongsanan et al. 2015).
Figure 41 – Morphology of Erioscyphella alba (MFLU 16-0614 holotype) a Substrate. b Apothecia on wood. c Apothecium on wood. d Cross section of an apothecium. e Cylindric hairs (in congo red reagent). f Septate, unbranched paraphyses (in Congo red reagent). g–j Short pedicellate asci (in Congo red reagent). k Amyloid ring at apical apex (in Melzer’s reagent). l–o Fusiform ascospores (in Congo red reagent). Scale bars: b = 500 µm, c = 200 µm, d = 400 µm, e = 30 µm, f = 40 µm, g–j = 20 µm, k = 10 µm, l–o = 5 µm
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