Hymenotorrendiella indonesiana Crous & P.R. Johnst., in Crous et al., Persoonia 44: 349 (2020)

MycoBank number: MB 835414; Index Fungorum number: IF 835414; Facesoffungi number: FoF 12899;

Saprobic on leaf litters on Eucalyptus sp. Sexual morph: Apothecia 0.4–0.8 mm wide × 0.5–1.0 mm high (x̅ = 0.6 × 0.7 mm, n = 20), superficial, arising scattered or gregarious in groups, stipitate when dry. Disc planet to slightly concave when dry, smooth, yellowish central with off-white edge. Receptacle cupulate, concolorous at the edge of disc, covered with dark brown setae. Stipe short, 0.2–0.4 mm long (x̅ = 0.3 mm, n = 20), smooth and dark brown. Setae mostly 15-25 per apothecium, 180–270 μm long, smooth, dark brown but paler on apex, 7-8 septa, thick-walled, constricted and bent at the base and connected with the central ectal excipulum cell. Hymenium 100–140 μm, hyaline with yellowish brown contents. Ectal excipulum 66–74 μm thick, comprised of 3–4 layers, thin-walled, hyaline cells of textura angularis with yellowish or brown exudate, inner layer of ectal excipulum comprised of narrow textura prismatica at stipe, non-gelatinous. Medullary excipulum 57–63 μm thick, comprised of thin-walled, loosely hyphae of textura intricata, 3.2–4.0 μm wide, hyaline, non-gelatinous. Paraphyses 2.8–3.4 μm (x̅ = 3.3 μm, n = 30) in the widest, sometimes branched and septate near the base, rounded apex, hyaline. Asci 88–110 × 7–10 μm (x̅ = 99 × 9 μm, n = 40), 8–spored, cylindric to subclavate, subconical apex with amyloid apical pore in Melzer’s reagent, tapering to subtruncate base. Ascospores (17.5–)18–26(–28) × (3.7–)4.0–4.9 μm (x̅ = 22 × 4.4 μm, n = 100), Q = (3.8–)4.1–6.2(–7.1) μm, Qm = 5.0 ± 0.6 μm, overlapping uniseriate to biseriate, fusiform with umbrella-shaped mucilaginous appendage at the ends, slightly curved, hyaline, thin-walled, smooth, aseptate with unipolar or bipolar and irregular guttules. Asexual morph: Undetermined.

Fig. XX – Hymenotorrendiella indonesiana (HKAS XXX, new geographical record). a Fresh ascomata on the leaf. b, c Dried ascomata on the leaf. d Vertical section of ascoma. e Ectal excipulum. f Medullary excipulum. g Hairs. h Asci and paraphyses. i Paraphyses j–l Asci (l Ascus in Meltzer’s reagent). m–p Ascospores. Scale bar: a = 4 cm, b–d = 300 μm, e = 70 μm, f = 40 μm, g = 100 μm, h = 50 μm, i = 30 μm, j–l = 50 μm, m, n–p = 10 μm.