FERTILE BODY: The upper surface,1.5-4 mm thick, 30-150 mm wide, sometimes specimens in group cover a large part of the tree. Sessile grow, spread, rounded, sometimes several smaller copies growth can be combined into a larger copy sometimes crossing over each other. The upper surface clearly zoned and hairy, hairs grow in small tufts, light gray to brown or yellow-brown color, edge is blunt, usually paler, sometimes whitish. Shades of green algae growing on the upper surface and all over the base. FERTILE BODY lower surface, the lower surface of the fruiting body is a layer of sporangia. Is undulating and covered with branched veins, grayish or whitish, aging becomes brown-purple. PROOF OF DISPUTE: white. MEAT: while wet, the elastic, gelatinous contents of his. The dried and hard corneous. MICROSCOPY: spores cylindrical, slightly curved, smooth, 13-14 x 5-6 um. HABITAT AND DISTRIBUTION: saprofit the extinct trees and branches, where he played an instrumental role in the decomposition of dead trees. It can be found as a parasite trees. PERIOD OF vegetation grows throughout the year, and zonality on the upper surface is the result of developmental lines (periods in which the fungus develops a fertile body). Usability: inedible mushrooms, rather tough and sinewy. SIMILAR SPECIES: Auricularia genus includes several species of which only the mushroom and Auricularia auricula-judae growth in Europe. Similarly zoned and hairy upper surface has hirsutum. Synonyms: Auricularia corrugata Sowerby 1800 Auricularia lobata Sommerf. 1826 Tremelloides Auricularia Bull. 1787 Gyraria violacea (Relhan) Gray 1821 Helvella mesenterica Dicks. 1785 Merulius mesentericus (Dicks.) Schrad. 1794 Phlebia mesenterica (Dicks.) Fr. 1828 Thelephora tremelloides (Bull.) Lam. & DC. 1826 Tremella corrugata Schwein. 1832