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Chlorociboria (order Helotiales) A genus of fungi in which the hymenium lines cup-shaped apothecia. In C. aeruginascens (Chlorosplenium aeruginascens) the apothecia are stalked, shallowly cup-shaped, and 5–10 mm across. This species grows chiefly on oak wood, which consequently becomes stained a bright blue-green and is valued for decorative purposes.