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All Fungi
Diatrypella quercina
Nomenclature
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Family: DiatrypaceaeGenus: Diatrypella
SUMMARY
Stromata densely scattered over large areas, 1.5-2.5 mm diam., black or dark brown, 0.8-1.2 mm high above the level of the bark, ± circular in outline, pulvinate, inside greyish brown. Black zone line continuing downwards, somewhat contracted in the bark, near the wood extending and running along the wood, continuous with those of the neighbouring stromata. Stroma surface roughened by the slightly protruding ostioles.
Anamorph: Libertella quercina, the conidiomata forming as locules within the young stroma. Conidiogenous cells formed as branches of conidiophores, elongate and tapering, proliferating sympodially. Conidia filiform, falcate, hyaline.
Teleomorph: ascomata perithecia, (350-) 450-750 µm diam., subglobose, sometimes angular due to compression, roughly in a single place within the stroma. Neck 150-170 µm thick and 300-550 µm high, ± prominent, sometimes very distinctly 3- or 4-sulcate, sometimes almost smooth, black and shining. Peridium ca 25 µm thick, brown, of an indistinct, narrow-celled structure, the neck densely lined with periphyses. Interascal tissue of sparse broad thin-walled tapering paraphyses, often evanescent by maturity. Asci 80-115 (spore-bearing part) x 12-14 µm, clavate to narrowly fusiform, distinctly long-stipitate, the apex rounded, thick-walled, with a ± distinct small apical ring. Ascospores 7.7-10 (-11) [measured directly from one end to the other] x 2.1-2.6 µm, strongly curved and sometimes almost semicircular; ends the strongly refractive, light brown, smooth, thin-walled, without a gelatinous sheath or appendages.