Phyllachora heterocladae C.L. Yang, X.L. Xu & K.D. Hyde., 2019

Yang, Chun-Lin, Xu, Xiu-Lan, Liu, Ying-Gao, Hyde, Kevin D. & Mckenzie, Eric H. C., 2019, A new species of Phyllachora (Phyllachoraceae, Phyllachorales) on Phyllostachys heteroclada from Sichuan, China, Phytotaxa 392 (3), pp. 186-196 : 192

Phyllachora heterocladae C.L. Yang, X.L. Xu & K.D. Hyde. sp. nov. Fig. 2

Index Fungorum number: IF555712, Facesoffungi number: FoF 05489.

Etymology: Refers to the host species from which the new taxon was collected.

Holotype: MFLU 18-1221 .

Parasitic on stems and branches of Phyllostachys heteroclada ( Poaceae ). Symptoms on host consist of black, abundant, subcuticular or intra-epidermal, raised, scattered, solitary to gregarious, ellipsoid, rugby ball-shaped or rhomboid, sometimes pale yellow to yellow stripe at the edge of tar spots. Sexual morph: Stromata 2.2–3.4 mm long, 1–1.4 mm wide, 0.12–0.15 mm high, oblong or sometimes subsphaeroidal, scattered, solitary to gregarious, subcuticular or intra-epidermal, erumpent on host when mature, black, carbonaceous, glabrous, multilocular. Ascomata 80–115 μm high, 165–240 μm wide, perithecia globose, subglobose or irregular, lying in host tissues and maturing in living tissues, ostiole inconspicuous, often 2–3 covering layers of host cuticle and epidermal cells above ascomata. Peridium 14–20 μm wide, clypeate, composed of brown to dark brown cells of textura angularis with slender, darker cells of outer layer, and large, slightly paler cells of inter layer. Paraphyses 1.7–2.2 μm wide, numerous, filiform, unbranched, septate, longer than asci, usually deliquescent when mature. Asci 167–190 × 9.9–11 μm (x =178 × 10.5 μm, n=20), 8-spored, persistent, cylindrical, with 15–24 μm long pedicel, walls uniform in thickness, not especially thickened at apex, apical ring perceptible, 2.7–3.2 μm wide. Ascospores 17–24 × 6–8 μm (x =20.3 × 7 μm, n=30), 1-seriate, fusiform to ellipsoid, hyaline, aseptate, with guttules, surrounded by a 11.6–18.1 μm wide, gelatinous sheath. Asexual morph: Coelomycetous, produced on stems and branches and often mixed with the sexual state. Spermogonia 282–335 μm wide, 91–125 μm high. Spermatiophores reduced to spermatiogenous cells. Spermatiogenous cells 10.8–19.2 × 2.6–3.3 μm, cylindrical or clavate, inflated near apex, straight or curved, hyaline, smooth, enteroblastic, formed from the inner layer of pycnidial wall. Spermatia 31–37.8 × 4.5–5.1 μm (x =34.8 × 4.8 μm, n=20), botuliform or falciform, narrowly rounded at both ends, curved, 1-septate or aseptate, hyaline, smooth-walled.

Material examined: CHINA, Sichuan Province, Ya’an City, Yucheng District, Kongping Township, alt. 1133 m, 29°50′8.56″N 103°2′59.87″E, on living stems and branches of Phyllostachys heteroclada Oliv. ( Poaceae ), 19 August 2017, C.L. Yang and X.L. Xu, YCL201708001 (MFLU 18-1221, holotype).

Figures

FIGURE 2. Phyllachora heterocladae (MFLU 18-1221/SICAU 17-0002, holotype). a Black spots on stem. b Stromata. c Horizontal section of ascomata. d Vertical section of ascomata. e Peridium in Melzer’s reagent. f Paraphyses. g–i Asci. j Apical ring of ascus. k, l Ascospores. m,n Ascospores with gelatinous sheath in ink. o Vertical section of spermogonium. p Spermatiogenous cells with spermatia. q–t Spermatia. Scale bars: a=5 mm, b,c=1 mm, d, o=100 μm, e, f, j, p–t=10 μm, g–i, k–n=20 μm.