A Grammatical Dictionary of Botanical Latin

thalamogenus,-a,-um (adj.A): derived from a thalamus, q.v., i.e. the receptacle of a flower, of a female organ (such as a gynoecium or archegonium) [> Gk. thalamus, a bed-chamber].

Calyptra,-ae (s.f.I) thalamogena; a thalamogenous calyptra, (in bryophytes) “a somewhat fleshy calyptra derived from the archegonial venter and axial or thalline tissue peripheral to the archegonium” (Magill 1990); = shoot calyptra;

- [[Hepaticae] calyptra matura ideo est optime thalamogena, basis etenim ejus, braeteas nunc plus minusve longe separatas gerens, ab ipsa rachi formatur (Lindb.), the mature calyptra, therefore, is chiefly thalamogenous [i.e. derived from the receptacle], since its base, bearing bracts more or less separated [i.e. divided off] by some distance, is formed from the rachis [i.e. axis or stem] itself.