Pleosporales » Pleosporales genera incertae sedis » Fusiformiseptata

Fusiformiseptata crocea

Fusiformiseptata crocea W. Dong, H. Zhang & K.D. Hyde

Index Fungorum number: IF 557939; Facesoffungi number: FoF 09284

Etymology: “crocea” in reference to the orange pigment in the neck

Holotype: MFLU 18-1721


Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascomata 255–280 μm high, 190–220 μm wide, black, scattered, immersed with a neck erumpent through host surface, uniloculate, ellipsoidal or obovoid, arrow-shaped at the basal region, coriaceous, ostiolate. Neck 230–260 μm high, 270–290 μm wide, 75–95 μm thick, prominent, subcylindrical or irregular, with flattened top, thick-walled, composed of two layers, with outer wall comprising several layers of thick-walled, dark brown to black cells of textura epidermoidea, inner wall comprising thin-walled, hyaline cells of textura epidermoidea with orange pigment. Peridium 30–70 μm thick, comprising several layers of dark brown, thick-walled, compressed cells of textura epidermoidea or irregular cells. Pseudoparaphyses 2.5 μm diam., numerous, cellular, broadly filiform, hyaline, septate, branched. Asci (85–)95–135(–150) × 16–20(–23) μm (x̄ = 112 × 18.5 μm, n = 15), 8-spored, bitunicate, clavate, short pedicellate, apically rounded with well-developed ocular chamber. Ascospores 36–42 × 6–9 μm ( = 40 × 8 μm, n = 10), biseriate, fusiform, straight or curved, hyaline, 1-septate when young, 4(–5)-septate when mature, deeply constricted at the central septum, asymmetrical, upper part shorter than lower part, guttulate, thin-walled, smooth, with a mucilaginous sheath, 15–25 μm wide. Asexual morph: Undetermined (Descriptions from Dong et al. 2020).


Culture characteristics: On PDA, colony irregular, reaching 25 mm in 10 days at 25 °C, grey from above, brown from below, surface rough, mucoid, raised, umbonate, edge undulate.


Material examined: THAILAND, Songkhla Province, on submerged wood in a stream, 10 May 2018, W. Dong, hat1111-1 (MFLU 18-1721, holotype), ex-type living culture MFLUCC 18-1415; ibid., hat1111-2 (HKAS 105059, isotype), ex-type living culture KUMCC 19-0080.


Freshwater distribution: Thailand (Dong et al. 2020)