Pleosporales » Phaeosphaeriaceae » Pseudoophiobolus

Pseudoophiobolus galii

Pseudoophiobolus galii Phookamsak, Wanas., Camporesi & K.D. Hyde, in Phookamsak, Wanasinghe, Hongsanan, Phukhamsakda, Huang, Tennakoon, Norphanphoun, Camporesi, Bulgakov, Promputtha, Mortimer, Xu & Hyde, Fungal Diversity 87: 326 (2017)

Index Fungorum number: IF 553925; Facesofungi number: FoF 03802

Etymology: The specific epithet ‘‘galii’’ refers to the host Galium, on which the species was collected

Holotype: MFLU 17-0927

Saprobic on Galium sp. Sexual morph: Ascomata 200–260 μm high (excluding papilla), 280–380 μm diam., dark brown to black, scattered, solitary to gregarious, immersed to semi-immersed in host epidermis, becoming erumpent through host epidermis by papilla, globose to subglobose, cupulate when dried, uni-loculate, glabrous, ostiolate, papillate. Papilla 130–200 μm high, 110–160 μm diam., mammiform to oblong, with rounded apex, composed of several cell layers of dark brown to black, pseudoparenchymatous cells, arranged in a textura angularis, Peridium 13–30 μm wide, composed of 3–5 cell layers of black, thick-walled, pseudoparenchymatous cells, arranged in textura angularis to textura prismatica, with hyaline, flattened cells towards the inner layers. Hamathecium composed of dense, 2–3.5 μm wide, filamentous, cellular pseudoparaphyses, distinctly septate, slightly constricted at the septa, anastomosing at the apex, embedded in a hyaline gelatinous matrix. Asci (120–)125–145(–152) × (6–)7–8(–9) μm (x̄ = 136.2 × 7.6 μm, n = 30), 8-spored, bitunicate, fissitunicate, cylindrical, short pedicellate, apically rounded, with well-developed ocular chamber. Ascospores (103–)105–135(–142) × 1.5–3 μm (x̄ = 118.5 × 2.2 μm, n = 30), fasciculate, scolecosporous, hyaline to subhyaline, becoming pale yellowish to brown at maturity, filiform, with rounded ends, tapered towards the lower cells, slightly swollen at the 9th cell near the septum, 17–18-septate, not constricted at the septa, smooth-walled. Asexual morph: Undetermined

Culture characteristics: Colonies on PDA reaching 32–38 mm diam. after 4 weeks at 25–30 °C, medium dense, circular, flattened, slightly raised at the middle, surface slightly rough, with edge entire, velvety to fluffy, slightly radiated outwards, colony from above, white pinkish to white-orangish, with white to pinkish-brown turfs or granules, colony from below, pale orangish radiated towards the margin, not producing pigmentation in agar.

Material examined: ITALY, Province of Forlì-Cesena [FC]), near Passo la Calla—Santa Sofia, on dead stem of Galium sp. (Rubiaceae), 4 June 2014, E. Camporesi, IT1914 (MFLU 17-0927, holotype), ex-type living culture, MFLUCC 17-2257 = KUMCC 17-0161


Notes: Multi-gene phylogenetic analyses show that Pseudoophiobolus galii is related to P. rosae, P. achilleae, P. erythrosporus and P. urticicola but resolves in weakly supported independent lineage. Pseudoophiobolus galii differs from related species in having larger asci and ascospores, while its ascospores are swollen at the 9th cell, near the septum.