The Collaborative International Dictionary of English v.0.48:
ascoma \ascoma\ n. 1. an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle. [WordNet 1.5]WordNet (r) 3.0 (2006):
ascoma n 1: an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle