Jattaea bruguierae Dayarathne, Jones E.B.G. & K.D. Hyde, sp. nov., Index Fungorum number: IF554045

Etymology: Name reflects the host genus Bruguiera.

Saprobic on fallen decaying twigs of Bruguiera cylindrica. Sexual morph Undetermined. Asexual morph Mycelium composed of vegetative hyphae, on half-strength seawater MEA, hyaline, 2.5–3.5 μm wide, septate, branched, smooth, partly compacted to form hyphal strands. Conidiophores hyaline, simple or branched, elongated, erect or flexuous, up to 45 μm long, sometimes ending with sterile cells. Conidiogenous cells enteroblastic, phialidic with periclinical wall thickening, discrete or adelophialides, with discrete phialides subcylindrical to elongate-ampulliform and constricted base, single or in conidiophores, 10–40 × 1–3 μm; adelophialides cylindrical, 2.5–8 × 1.5–3 μm; collarettes distinct,1–2.5 μm long, 1.5–2 μm wide, with 1.5 μm wide opening. Conidia 3.5–4.5 × 2.0–3.0 μm (x̅ = 4 × 2.5 μm, n = 20), hyaline, aseptate, cylindrical with a tapered and truncate base, smooth-walled, sometimes held together in droplets.

Cultural characteristics: Colonies on half-strength seawater MEA flat, fimbriate edge,with floccose aerial mycelium; surface white, buff, cinnamon to orange, turning sepia with age, reverse pale luteous, orange, turning amber with age, 30 mm within 2 weeks (25 °C). Conditions for growth: min 15 °C, max 30 °C, opt 25 °C. Colonies on half-strength seawater PDA flat, fimbriate edge, with floccose aerial mycelium; surface white, buff, cinnamon, turning dark sepia with age, reverse pale luteous, orange, turning umber with age. 20 mm within 2 weeks (25 °C)
Material examined – THAILAND, Ranong Province, Amphoe Maung, Mu 4 Tombol Ngao, Ranong Mangrove Research Center (GPS: 9°43′ to 9°57’N; 98°29′ to 98°39’E), on fallen decaying twig of Bruguiera cylindrica, 6 December 2016, Monika C. Datarathne, MCD 038 (MFLU 17-2648 holotype), ex-type living culture, MFLUCC 15–1277, TBRC.

Notes: Jattaea bruguierae which is currently known only from its asexual morph, is distinct from J. mookgoponga by its hyaline, elongated conidiophores and cylindrical conidia with a tapered base, while J. mookgoponga comprises yellow brown conidiophores and cylindrical to ellipsoidal conidia with obtuse ends on MEA (Damm et al. 2008). Based on phylogenetic analysis, J. leucospermi is also closely related to Jattaea bruguierae which is so far known only as a phialophora-like asexual morph.

Fig. Jattaea bruguierae (MFLU 17-2648, holotype). a Host. b, c Culture on half strength sea water MEA (b from upper, c from lower). d Appearance of type in culture. e Conidiophores. f–i Phialides. j–m Conidia. Scale bars: e, f = 20 μm, g–i = 10 μm, j–m= 5 μm.