AppearanceThis species has apothecia that are usually attached laterally, often less than 0.5 cm in diameter, collapsing laterally and becoming rolled inwards when dry. The outer tissue layer of the apothecium, known as the ectal excipulum, has a delicate tomentose surface composed of hair-like, straight or sometimes coiled, smooth hyphae. The stipe is typically less than 3 mm long, with a central or eccentric attachment to the apothecia. Spores are roughly spindle-shaped , smooth, and 5–8 by 0.7–2.8 µm. Apothecia grow on bark-free wood, especially oak, part of which at least is stained greenish by the mycelium. The abundant paraphyses, which may be entwined, are 55–95 by 1.5–2 µm, filiform, and septate with an unswollen, unbent apex that often extends beyond the level of the asci tips.
The species is distinguished from the closely related ''C. aeruginosum'' by having smaller spores. Although some authors have in the past failed to recognize any appreciable differences between the two species, Ramamurthi and colleagues note that not only are the spore sizes different, but ''C. aeruginascens'' have smooth tomentum hyphae, in contrast with the roughened hyphae of ''C. aeruginosum''.
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