Chlorociboria is a genus of fungi within the subphylum Pezizomycetes. The genus includes 17 species. Two common temperate zone species, Chlorociboria aeruginascens and Chlorociboria aeruginosa, can only reliably be distinguished by microscopic examination. Chlorociboria aeruginosa has larger spores (9–15 µm × 1.5–2.5 µm) and the worm-like cells of the outer surface are rough, unlike the commoner C. aeruginascens, of which the spores are 6–10 µm × 1.5–2 µm.