Pleosporales » Didymosphaeriaceae » Austropleospora

Austropleospora ochracea

Austropleospora ochracea Petr., Sydowia 12: 485 (1959) [1958]

Index Fungorum number: IF557841,        Facesoffungi number: FoF 07933

 

Sexual morph: Ascomata 150–230 μm high, 180–250 μm diam. ( x = 190 × 200 μm, n = 10), black, scattered, solitary to gregarious, immersed under host epidermis, slightly raised, globose to subglobose, uni-loculate, short ostiole in the center with a pore-like opening. Peridium 15–20 μm wide ( x = 18 μm, n = 15), of equal thickness, composed of several layers (3–5 layers), of flattened to broad, hyaline to brown cells, arranged in textura angularis to textura prismatica. Hamathecium composed of 1–2.5 μm wide (n = 30), numerous, filamentous, cellular, hyaline pseudoparaphyses. Asci 80–110 μm × 10–15 μm ( x = 97 × 12 μm, n = 25), 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, short pedicellate. Ascospores 10–20 μm × 5–7 μm ( x = 15 × 6 μm, n = 30), overlapping uniseriate, muriform, mostly ellipsoidal, with 3 transverse septa, 0–1-longitudinal septa, initially hyaline, becoming yellowish-brown at maturity, asymmetrical, conical and narrowly rounded at the ends. Asexual morph: Undetermined.

 

Habitat: Parasitic on living leaves.

 

Known hosts: Grewia multiflora (Petrak 1983), Malvaceae (Hyde et al. 2020).

 

Known distribution: Guizhou Province, China

 

Material examined: CHINA, Guizhou Province, Guiyang, Guizhou University, on dead twigs of an undetermined host, 5 October 2019, L.S. Dissanayake (HMAS 248367, holotype), ex-type living culture, KUMCC 20-0020

 

GenBank Accession No: LSU: MN364645, SSU: MN364416.

 

Notes: Asterostomella species reported from Malvaceae include A. diplocarpa, A. grewiae, A. helicteris and A. isothea. Our new collection is similar to Asterostomella grewiae in the size of pycnothyria (71–93 μm vs 40–90 μm in diameter), hyphopodia (8–11 × 6–9 μm vs 5–8 × 6–11 μm) and pycnothyriospores (12–15 × 10–11 μm vs 10–17 × 6–10 μm), as well as 4-lobed hyphopodia and the host leaves.