A Grammatical Dictionary of Botanical Latin

Diverticulum,-i (s.n.II), abl.sg. diverticulo, nom. & acc. pl. diverticula, dat. & abl. pl. diverticulis: a diverticule, sac, pouch or pocket opening from a hollow organ [> L. diverticulum,-i (s.n.II); also deverticulum,-i (s.n.II), a byroad].

1. “in Algae, a protoplasmic protrusion, communicating with the fused procarp cells and the placenta, as in Gracilaria confervoides, Grev.” (Jackson); (algae) “a filament composed of the fused cells of a fertilized procarp in certain red algae and giving rise to carpospores” (Jackson).

2. (fungi) in Pythium, a lateral mycelial branch;(fungi) “a structure, often pouchlike, that has arisen or developed from another and usually larger one, as on the mycelium of Pythium, or a short, vertical branchlet of a repent surface hypha of a pileus” (S&D).

Apiculus,-i (s.m.II), abl.sg. apiculo, (fungi) “a short, sharp, but not stiff, point; (of basidiospores) commonly (but improperly) used for the short, often sharp, diverticule at the basal end of the spore, by which it is or was attached to the sterigma and from which a droplet is exuded at the instant of discharge (see Heim, 1931)” (S&D).

Sterigma,-atis (s.n.III), q.v., “in Fungi, a stalk from which a spore is abjointed” (Jackson).