"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.The hyphae and fruiting bodies of all species make xylindein, a secondary metabolite that stains the substrate wood blue-green, with "green oak" being a valued commodity in woodworking.