Pteridiospora arengae

Pteridiospora arengae

Konta & K.D. Hyde (2023)

Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales- Astrosphaeriellaceae-Pteridiospora

Host species: Arenga pinnata (Konta et al. 2023)

Holotype: MFLU 15-0035 (Konta et al. 2023)

Known distribution: Phang-Nga, Thailand

IF Number: IF559675      Mycobank Number: 559675     FOF Number: FoF10820

Description

Saprobic on dead petioles of Arenga pinnata. Sexual morph: Ascostromata 250–400 μm high, 550–850 μm diameter (x̅ = 325 × 690 µm, n = 20), scattered, solitary, erumpent to superficial, mammiform to conical, visible as numerous, raised, black dome-shaped areas on the host surface, carbonaceous, ostiolate. Ostiole central, with pore-like opening. Peridium 40–70 µm (x̅ = 57 µm, n = 20) wide, of unequal thickness, poorly developed at the base, composed of dark brown to black, cells of textura angularis. Pseudoparaphyses 1–2 μm (x̅ = 1.34 µm, n = 20) wide, hyaline, numerous, filiform, trabeculate pseudoparaphyses. Asci 80–150 × 10–15 µm (x̅ = 115 × 12 µm, n = 20), 8-spored, bitunicate, cylindrical, apically rounded, with a short club-shaped pedicel, apically rounded with a minute ocular chamber. Ascospores 25–40 × 3–10 µm (x̅ = 32 × 5.5 µm, n = 20), overlapping bi-seriate, ellipsoidal to sub-fusoid, 1(–3)-septate, hyaline, constricted at the septum, with rounded to acute ends, guttules, surrounded by a thick mucilaginous sheath. Asexual morph: Undetermined.

Culture conditions: Ascospores germinating on MEA within 12 hr. Colonies on MEA from above, white-brown on the surface; wrinkled, irregular with undulate to lobate edge; colonies from below, yellow-brown, circulars, with undulate to lobate edge.