A Grammatical Dictionary of Botanical Latin

nigrescens,-entis (part.B): becoming black, growing dark in color, growing dark;

- colore etiam pallido, cum herbae virore mixto, fuligine quasi afflato ac ita sensim nigrescente, and with the color also pale, mixed with the greeness of an herb, as if blown on with soot and thus gradually becoming black.

- frutex glaber, siccus nigrescens (B&H), a shrub, when dry blackish.

- arbores, succo glutinoso demum nigrescente (B&H), trees, with a glutinous sap finally becoming dark in color.

- planta sicca virescens v. nigrescens (B&H), plant when dry greenish or blackish.

- (algae) caespites obscure purpurei, exsiccati fere nigrcscentes (Agardh), the clumps dull purple, when dried out almost blackish.

- (algae) Caespes minutus uncialis vel parum ultra, ex purpureo nigrescens, chartae laxe adhaerens (Agardh), the clump minute, an inch long or somewhat more, from purple to blackish, loosely adhering to paper.

- caespes ex purpureo griseus, exsiccatione nigresccns (Agardh), the clump from a purple to gray, upon drying out, blackish.

NOTE: nigrescens, nigricans: blackish (Lindley).