A Grammatical Dictionary of Botanical Latin

Root-cap, also root-tip, “large cells which form a cap-like covering for the smaller cells in rear (growing point)” (Jackson); see spongiola,-ae (s.f.I).

Pileorhiza, “the cap of a root; a membranous hood found at the end of the roots of Nuphar and other plants, and distinct from the spongiole” (Lindley); “the root-cap; a hood at the extremity of the root” (Jackson) [> Gk. “pileos, Lat. pileus, a cap + rhiza, a root” (Jackson)]; see pileus.

The true root: “the outer single layer of cells, known as the dermatogen, in addition to giving rise to the epidermis, forms the cap-shaped mass of tissue called the root-cap or pileorhiza, by which the growing apex of the root is always clothed.

Calyptra,-ae (s.f.I), q.v.: “a term proposed by Van Tieghem and Douliot for that portion of the root-cap in lateral roots which belongs strictly to the root-system” (Jackson).

- radices pigmentiferae, calyptris acutis, seriatim fasciculatae, usque ad 17, quarum primae 3-5 folium rudimentale perforantes, ceterae liberae, roots pigmented, the root-caps acute, clustered in rows, up to 17, of which the first 3-5 pierce through the rubimentary leaf, the rest free (Stearn).