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Atradidymella sp. P07988
Family: DidymellaceaeGenus: Atradidymella
Anamorph: conidiomata pycnidia, solitary or in clusters, erumpent and sometimes becoming almost superficial, 80-150 x 70-120 µm, globose to subglobose with a short papillate neck, initially hyaline with a dark neck, the entire wall becoming dark with age. Conidiomatal wall consisting of 3-4 layers of flattened pseudoparenchymatous cells. Conidiogenous cells broadly ampulliform, mostly wider than tall, 3-7 × 3-5 μm in size, proliferating percurrently. Conidia 3-4.2 × 1.2-1.5 μm, cylindric-ellipsoidal to bacilliform, rather irregularly shaped and sometines curved, hyaline, aseptate, smooth, without a gelatinous sheath or appendages, exuded as a slimy droplet.
Teleomorph: ascostromata perithecial, 70-130 × 60-110 μm, solitary or in small clusters, erumpent from a minute stroma within the underlying host cell, subglobose to pyriform, sometimes with short, occasionally septate setae around the ostiole, dark brown. Peridium ca 10 μm thick with three layers of pseudoparenchymatous cells, the outermost with darkly pigmented walls. Interascal tissue initially pseudoparenchymatous, sometimes persisting as septate filamentous remnants in mature ascomata. Asci grouped in a small fascicle at the base of the ascoma, 38-48 x 6-9 µm, cylindrical to cylindric-clavate, very short-stalked, thick-walled and fissitunicate but without a clearly delimited ocular chamber, not staining in iodine, 8-spored. Ascospores arranged biseriately, 12-14.5 x 2.8-4 µm, fusiform, the ends acute, often slightly curved, slightly constricted at the single supramedian septum, the upper cell usually broader than the lower, golden brown to grey-brown, thin- and smooth-walled, without a gelatinous sheath or appendages.