A Grammatical Dictionary of Botanical Latin

Tubercule, “simple roots which acquire a succulent condition, become reservoirs of vegetable food, and serve for propagation, in consequence of being terminated by a bud. A little tuber” (Lindley); “1. a little tuber; 2. a wart-like apothecium in Verrucaria; 3. any similar excrescence, as on roots, ascribed to the action of symbiotic organisms; 4. a tuberous root, as of the Dahlia (Crozier)” (Jackson): tuberculum,-i (s.n.II), q.v., abl. sg. tuberculo;

- (moss) operculum in Pohlia elongata, Mnio caespititio pluribusque aliis mammillare vel papilliforme, nempe convexum, tubérculo parvo instar papillae medium occupante; (Bridel), the operculum in Pohlia elongata, Mnium caespititium and many other [species] mammilar or papilliform, in other words, convex with a small tubercle like a papilla occupying the middle.

NOTE: tuberculum,-i (s.n.II) “a wart-like shield [i.e. reproductive body] such as is found in the genus Verrucaria” [a lichen] (Lindley).