Trichomerium camporesii

Trichomerium camporesii Marasinghe & K.D. Hyde, in Hyde et al., Asian Journal of Mycology 3(1): 179 (2020)

Index Fungorum number: IF556916         Facesoffungi number: FoF06236

Sexual morph: Black sheets of mycelia cover the leaves of the host with dark brown superficial, scattered, ascostromata. Hyphae septate, cylindrical, pale brown to brown with constrictions at the septa, 4.5–6 μm wide (x̄ = 5.5 μm, n = 20). Ascostromata 55–65 × 45–55 μm (x̄ = 60 × 48 μm, n=10) globose to subglobose, brown, covered with attached aseptate to septate, dark brown to brown setae. Ascostroma wall 70-80 μm wide (x̄ = 65 μm, n=10), thick-walled, inwardly hyaline, pale brown and brown towards the outside, comprised 2–3 layers of textura angularis. Asci 55–60 × 20–25 μm (x̄ = 57 × 22 μm, n = 10), 8-spored, bitunicate, ellipsoid to clavate, some subglobose, with or without short pedicle. Paraphyses not observed. Ascospores 25–30 × 5–10 μm (x̄ = 28 × 8 μm, n = 10), fasciculate, hyaline, fusoid, ends rounded, 3 septate, with 1–2 distinct guttules, slightly curved at the middle, smooth-walled. Asexual morph: Undetermined.

Habitat: Epiphytic on the surface of Psidium guajava leaves.

Material examined: Thailand, Chiang Rai, on living leaf of Psidium guajava (Myrtaceae), 21 June 2018, M.W.D Sandamali (MFLU 19–2251, holotype).

GenBank Accession No: LSU: MN644511, ITS: MN644590.

Notes: Trichomerium camporesii is similar to T. foliicola, but differs in having ellipsoid to clavate asci and slightly curved ascospores with relatively large 1–4 guttules, while T. foliicola has cylindrical to clavate asci with relatively small 1–2-guttulate ascospores. Phylogenetic analysis based on LSU and ITS sequence data shows that T. camporesii constitutes an independent lineage basal to T. eucalypti (92 % ML, 1.00 BYPP).