A Grammatical Dictionary of Botanical Latin

Hypothecium, hypothece: “the cellular stratum below the thalamium of Lichenals” (Lindley); a layer of hyphal tissue immediately beneath the hymenium in certain Cryptogams (Jackson); “the hyphal layer under the hymenium of an apothecium” (Ainsworth & Bisby): hypothecium,-ii (s.n.II), abl. sg. hypothecio; syn. subhymenium,-ii (s.n.II), abl. sg. subhymenio; syn. stratum (s.n.II) subhymeniale (adj.B), abl. sg. strato subhymeniali, the subhymenial layer (Jackson); cf. thecium, epithecium syn. subhymenium,-ii (s.n.II), abl. sg. subhymenio;

- [lichen] hymenium seu thecium contentum hypothecii indicat; thalamium thecasque complectitur et materia gummosa, lichenina, perfunditur, quam gelatinam hymeneam nominavi (Nyl.), the [sc. word] hymenium or thecium indicates the content of the hypothecium; it surrounds the thalamium and thecas and is soaked in a gummy material, licheninum, which I have called the hymenean gelatine.

“The open, saucer- or cup-shaped [cupulate] fruit body of the apothecium that is sessile and fleshy, is composed of three parts: the hymenium (the upper concave surface), the hypothecium, and the excipulum. Asci are developed in the hymenium layer, where they are exposed at maturity.”