Chaetocapnodium siamensis – Facesoffungi number: FoF 00397

Chaetocapnodium siamensis Hongsanan & K.D.Hyde.
Index Fungorum: IF631613, Facesoffungi number: FoF 00397; Fig. 1.
Etymology: siamensis is siam + ensis from Latin meaning “of Siam” or “Thailand”.
Holotypus: MFLU 14–0747

Saprobic on the upper surface of leaves. Superficial hyphae 4–5μm wide, septate, constricted and dark at the septum. Sexual morph Ascomata 110–120μm diam. (x=116μm, n=5), superficial, mostly solitary, subglobose, broad at the centre, dark brown, with apical setae. Setae 12–17×2–4μm (x=15×3μm, n=5), short, aseptate, brown. Peridium 20–25μm (x=22μm, n=5), comprising two layers of cells of textura angularis, inner layer hyaline, outer layer brown, thickened at the base. Hamathecium lacking pseudoparaphyses. Asci 34–41×11–14μm (x=38×13μm, n=5), 8-spored, bitunicate, fissitunicate, cylindrical to clavate, short pedicellate or apedicellate. Ascospores 9–15×4–6μm (x=12×5μm, n=10),bi to tri-seriate, oblong to ellipsoid, 3-septate, constricted and dark at the septum, hyaline when immature and brown at maturity, smooth-walled. Asexual morph Undetermined.

Material examined: THAILAND, Chiang Rai, Tasud, on leaves of unidentified plant, 17 September 2013, S.Hongsanan SOY3 (MFLU 14–0747, holotype); ex-type living culture, MFLUCC 13–0778. GenBank LSU: KP744479.

Fig. 1 Chaetocapnodium siamensis (holotype). a, b Specimens c Ascoma on surface of leaves d Section through ascoma e Peridium f Thallus under ascoma g Setae on ascoma h Upper wall of ascoma i Ascus when immature j Ascus at maturity k, l Ascospores when immature m–o Ascospores at maturity p Conidia of possible associated taxa. Scale bars: c, d=100μm, f, p=20μm, e, h, i, j=10μm, g, k, l, m, n, o=5μm.