the rostellum of the stigma of violets, or of the operculum of many mosses

KT extinction event

In fact, Darwin was unable to decide on a suitable present, telling his roommate that he was up a stump about what to get for his sister and new brother-in-law.

How now, my lord! why do you keep alone, / Of sorriest fancies your companions making, / Using those thoughts which should indeed have died / With them they think on?