Aschersonia calendulina Hywel-Jones & Mongkols., Mycol. Res. 113(6–7): 687 (2009)
Parasitic on unidentified insect. Sexual morph: undetermined. Asexual morph: Conidiomata 1400 2200 × 450–550 μm, reddish brown, with a slimy yellowish mass on the surface of conidiomata, hypophyllous, stromatic, pycnidial, solitary, rounded in outline, roughened, flattened, multilocular, with immersed, globose or subglobose to obpyriform locules, 250–550 μm diam., 500–650 μm high, thick walled, glabrous, ostiolate. Ostiole well-developed, subcylindrical, single to each locule, centrally located, Conidiomatal wall 100–200 μm wide, composed of thick walled, brown cells of textura oblita to textura epidermoidea in the outer layers, becoming hyaline cells towards conidial hymenium. Paraphyses 160–300 × 1–2 μm, hyaline, arising from the inner wall layer of locules, hyaline, filiform, tapered towards apex. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 8–15 × 1–2 μm, hyaline, enteroblastic, phialidic, cylindrical to subcylindrical, determinate, smooth. Conidia 11–13 × 2–3 μm ( ̄x = 12 × 2.5 μm, n = 50), hyaline, fusiform, unicellular, usually straight, thick- and smooth walled, guttulate.
Material examined: Thailand, Chiang Rai, on unidentified insect on living leaves of bamboo, Jing-Zu Sun, 10 February 2015, MRC15021007 (MFLU 16-2918).
Aschersonia calendulina (MFLU 16-2918, asexual morph) a Herbarium specimens. b, c Appearance of reddish brown conidiomata. d–f Vertical sections of conidiomata. g, h Vertical sections of peridium. i Paraphyses. j, k Conidiogenous cells and developing conidia. l Conidia. Scale bars: b–d = 500 μm, e = 200 μm, f = 100 μm, g–i = 50 μm, j–k = 5 μm, l = 10 μm.
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