A Grammatical Dictionary of Botanical Latin

Carcharus,-i (s.m.II), abl.sg. carcharo = Gk. karcharias,-ou (s.m.III) “a kind of shark, so called from its saw-like teeth” (Liddell & Scott): “a kind of fish” (Glare); “a kind of dog fish” [i.e. small shark] (Lewis & Scott) [karchareos,-a,-on (adj.) “saw-like, jagged, so, with saw-like jagged teeth (such as a dog might have) (Liddell & Scott); see fish;

- Lichen saxatilis latifolius viridis, corium carchariæ piscis referens, ad foliorum apices exanthemata sua condens (Dill.), a lichen growing on stones], wide-leaved, green, resembling the skin of the fish carchar [i.e. perhaps a kind of small shark (dogfish); sharkskin] forming at the apices of the leaves its own pustules.

NOTE: shagreen, sharkskin: “the rough skin of various sharks and rays when covered with small close-set tubercles” (WIII).

NOTE: in Dillenius’ passage above, ‘carchariae’ suggests the nom.sg. [to Dillenius] is ‘carcharia.’