Definition from Wiktionary, the free dictionary
thecium (plural thecia)
- (mycology, dated) The hymenium
1952, Frederick Lyle Wynd, The Fungi, translation of original by Ernst Albert Gäumann, page 218:
- The hymenium, or thecium, is generated endogenously within the hyphal layer.
- (mycology, dated) The internal hyphal layers of an apothecium