Pleosporales » Phaeosphaeriaceae » Leptospora

Leptospora galii

Leptospora galii N.I. de Silva & K.D. Hyde, in Hyde et al., Fungal Diversity 80: 96 (2016)

Index Fungorum number: IF 552317; Facesofungi number: FoF 02441

Etymology: Name reflects the host genus Galium.

Holotype: HKAS 92493a

Saprobic on dead branch of Galium sp. Sexual morph: Ascomata 105–226 μm high, 109–188 μm diam., solitary, scattered to clustered, immersed to semi-immersed to erumpent, globose to subglobose, glabrous, visible as raised, black spots on host surface. Peridium 18–25 μm wide, unevenly thickened, two-layered; inner layer comprising 3–4 cell layers of hyaline cells of textura angularis or 3–4 cell layers of flattened, hyaline cells of textura prismatica; outer layer comprising several layers of brown to dark brown cells of textura angularis. Hamathecium composed of dense, 1.5–2.5 μm wide, filamentous, septate, cellular pseudoparaphyses, anastomosing at the apex. Asci 55–87 × 3.7–6.9 μm (x̄ = 70 × 5.2 μm, n = 30), 8- spored, bitunicate, cylindric-clavate, short pedicellate, with an obtuse to slightly furcate end, apically rounded, with ocular chamber when immature and indistinct at maturity. Ascospores 17–32 × 2.1–3.3 μm (x̄ = 23.2 × 2.7 μm, n = 30), overlapping bi-seriate, hyaline, elongate fusiform with obtuse ends, and sometimes curved at ends, 1-septate at maturity, guttulate. Asexual morph: Undetermined.

Culture characteristics: Colonies on PDA 32–35 mm diam. after 3 weeks, colonies sparse, circular, flat, surface smooth with entire edge, velvety with smooth aspects, zonate with different sector light brown to brown at the margin whitish-grey at the centre; reverse light brown at margin, brown at the middle, dark brown at the centre.

Material examined: ITALY, Forlı`-Cesena Province, Monte Mirabello-Predappio, on dead branch of Galium sp. (Rubiaceae), 11 May 2015, E. Camporesi, IT2478 (HKAS 92493, holotype), (MFLU 15-1230, isotype); ex-type living culture KUMCC 15-0521, MFLUCC.


Notes: Our new species clearly fits into Leptospora where all species constitute a monophyletic clade with high support. In addition, phylogenies also reveal that L. galli is phylogenetically distinct as it branches basal to other species with high support. Leptospora galii differs from other Leptospora species by having hyaline, elongate, fusiform, rarely light yellow, mature, 1-septate ascospores, 17–32 μm long, while other Leptospora species in the same clade have brown, filiform, multi-septate ascospores more than 60 μm long (Hyde et al. 2016).