S.N.Zhang, K.D.Hyde & J.K.Liu. MycoKeys 49: 115
Dothideomycetes, Subclass Pleosporomycetidae
Striatiguttula S.N. Zhang, K.D. Hyde & J.K. Liu, MycoKeys 49: 111 (2019)
Striatiguttula nypae S.N.Zhang, K.D.Hyde & J.K.Liu. MycoKeys 49: 112 (2019).
Striatiguttula phoenicis S.N.Zhang, K.D.Hyde & J.K.Liu. MycoKeys 49: 115 (2019).
MycoBank: MB828275 Facesoﬀungi: FoF 05035
Saprobic on mangrove date palm Phoenix paludosa. Sexual morph: Ascomata: in vertical section 195–580 μm high, 135–390 μm diameter, (( = 396.0 × 230.3 μm, n = 15), black, scattered, rarely gregarious, immersed, and erumpent through host epidermis by a papilla or a short neck, ampulliform, subglobose, uni-loculate, coriaceous to carbonaceous, ostiolate, periphysate, papillate, glabrous or somewhat interwoven pale brown hyphae or setae, lying around apex of the neck. Peridium: 10–24 μm thin, composed of several pale brown to hyaline cells of textura angularis, compressed and pallid inwardly. Wall of the neck composed thick and elongated angular pale brown to brown cells with hyaline inner layers. Hamathecium: of 1–2 μm wide, septate, branched, filamentous, anastomosing, trabeculate pseudoparaphyses, embedded in a gelatinous matrix. Asci: 89–141 × 12–18 μm, (( = 120.5 × 15.4 μm, n = 20), 8-spored, bitunicate, fissitunicate, cylindric-clavate, pedicellate, apically rounded, with an ocular chamber. Ascospores: 20–29 × 6–10 μm, (( = 24.5 × 7.8 μm, n = 40), hyaline to brown (all cells nearly concolorous), uniseriate to biseriate, fusiform to ellipsoidal, 1–3-septate, constricted at the central septum, the upper middle cell slightly swollen and larger, straight or slightly curved, striate, guttulate, surrounded by an irregular mucilaginous sheath. Asexual morph: Undetermined.
The fusiform to ellipsoidal, 1–3-septate ascospores of Striatiguttula phoenicis is similar to those of Trematosphaeria mangrovis, associated with submerged roots of mangrove trees. However, S. phoenicis diﬀers from T. mangrovis (Kohlmeyer 1968) as the latter has larger ascospores and lacks striations.
Striatiguttula phoenicis (holotype MFLU 18-1579). a–c. Appearance of ascoma on host surface; d,e. vertical section through an ascomal; f. ostiole; g. apex of the neck, with somewhat interwoven pale brown hyphae or setae; h. structure of peridium; i,j. pseudoparaphyses; k–n. asci; o–t. ascospores; u. ascospore in India ink and presenting a clear mucilaginous sheath; v. germinating ascospore; w. colony on PDA. Scale bars: 500 μm (a), 100 μm (b, c), 200 μm (d, e), 50 μm (f, g), 20 μm (h, k–n), 10 μm (i, j, o–v).