BASIDIOMYCETES

Jelly fungus (Tremella mesenterica) a large and diverse class of fungi (division Mycota) including jelly and shelf, or bracket, fungi; mushrooms, puffballs, and stinkhorns; and the rusts and smuts. The club-shaped spore-bearing organ (basidium) usually produces four sexual spores (basidiospores). Basidia are borne on fruiting bodies (basidiocarps), which are large and conspicuous in all but the rusts and smuts. The common name bird's nest fungus includes species of the genera Crucibulum, Cyathus, and Nidularia of the order Nidulariales (about 60 species). The hollow fruiting body resembles a nest containing eggs (peridioles). The peridioles carry the spores when they disperse at maturity. The 15 species of the order Exobasidiales do not form fruiting bodies. The species, parasitic on higher plants, cause leaf spots, witches'-broom (tufted growth), and galls (swellings). Particularly affected are azaleas and rhododendrons. Jelly fungus is the common name for several species of the cosmopolitan order Tremellales, including those of the genus Tremella (40 species), so called because they have jellylike fruiting bodies. Frequently brightly coloured (especially yellow and orange) or white, the fungi occur on decaying wood after heavy rains in late summer. Auricularia The ear fungus (Auricularia auricula-judae), also called Jew's ear fungus, is a brown, gelatinous edible fungus found on dead tree trunks in moist weather in the autumn. One of 10 widespread Auricularia species, it is ear- or shell-shaped and sometimes acts as a parasite, especially on elder (Sambucus).