sessile

adj

Etymology: From Latin sessilis (“sitting”), from sessus, perfect passive participle of verb sedeō (“to sit”), + adjective suffix -ilis. Compare session.

1. Permanently attached to a substrate; not free to move about.

   “a sessile oyster”

2. Attached directly by the base; not having an intervening stalk; stalkless.

   “The pileus is sessile, or sometimes narrowed at the base into a short stem, the caps often numerous and crowded together in an overlapping or imbricate manner.”

   “The sporophyte foot is also characteristic: it is very broad and more or less lenticular or disciform, as broad or broader than the calyptra stalk[…], and is sessile on the calyptra base[…]”