Asterinales » Asterinaceae » Asterostomella

Asterostomella grewiae

Asterostomella grewiae Petr., Sydowia 12: 485 (1959) [1958]

Index Fungorum number: IF293504         Facesoffungi number: FoF06899

 

Sexual morph: Undetermined. Asexual morph: Colonies epiphyllous, densely scattered, confluent. Hyphae straight to substraight, loosely reticulate. Hyphopodia 8–11 × 6–9 μm (x̄ = 9 × 7 µm, n = 5), 2-celled, mostly lobed. Pycnothyria 71–93 μm (x̄ = 80 µm, n = 20) in diameter, superficial, dark brown, seated on a thin, hyaline basal stroma with a central X- or Y-shaped dehiscence. Upper wall comprising radial arranged square cells, with meandrous marginal cells. Pycnothyriospores 12–15 × 10–11 μm (x̄ = 14 × 10.5 µm, n = 30), aseptate, ovoid to pyriform, 2-layered.

 

Habitat: Parasitic on living leaves.

 

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

 

Known distribution: Philippines (Petrak 1983), Thailand (Hyde et al. 2020).

 

Material examined: Thailand, Chiang Mai, Mae Taeng, Pa Pae, Bahn Pa Deng, 128 Moo 3,

Mushroom Research Centre, on the living leaves of Malvaceae, 22 November 2013, X.Y. Zeng

(MFLU130629, new sequence data and geographical record, reference specimen designated here).

 

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.