athalamous
adjective
athal·a·mous
(ˈ)āˈthaləməs
1
: lacking a torus or receptacle
athalamous flowers
2
: without apothecia, beds, or shields for spores
athalamous lichens
Word History
Etymology
a- entry 2 + Latin thalamus marriage bed, bedroom (from Greek thalamos bedroom, room) + English -ous; akin to Greek tholos rotunda