The two species of Chlorociboria are very similar to each other macroscopically and only differ microscopically by the size of their ascospores. The spores of Chlorociboria aeruginosa are typically larger (9-14 x 2-4 ตm) than those of C. aeruginascens (5-7 x 1-2 ตm). These two fungi are distributed throughout the temperate forests of the world and are the only two species of Chlorociboria found in North America. New Zealand has 15 species, some of which like highly rotted wood while others prefer harder wood.