From Wiktionary, the free dictionary
From hypo- + thecium.
hypothecium (plural hypothecia)
- The layer of hyphal tissue directly beneath the thecium
2015 September 29, “A Molecular Phylogeny of the Lichen Genus Lecidella Focusing on Species from Mainland China”, in PLOS ONE[1], →DOI:Color of hypothecium: 0 = colorless; 1 = yellow-brown to red-brown. 4.
