A Grammatical Dictionary of Botanical Latin

Fibril (Eng.noun), a very small fiber; “the roots of Lichens; any kind of small thread-shaped root; also applied occasionally among Fungals to the stipe” (Lindley); the fine, fiber-like wall thickenings in hyaline cells and sometimes cortical cells of Sphagnum; (in fungi) “a minute fiber, thin and threadlike; see ‘fibrillose" (S&D): : fibrilla,-ae (s.f.I), abl.sg. fibrilla, nom. pl. fibrillae, acc. pl. fibrillas, abl.pl. fibrillis [> L. dim. of fibra,-ae (s.f.I), fiber].

- pileus mox laeviusculus, mox fibrillis albidis satis dense obsitus, e cinnamomeo in sordide violaceum nonnumquam vergens (S&A), the pileus soon somewhat smooth, afterwards quite densely beset with whitish fibrils, sometimes approaching from cinnamon into a dirty violaceous [sc. color].

- foliis radicalibus basi fibrillis foliorum antiquiorum vestitis, (Boissier), with the basal leaves covered at the base with the fine-fibers of the older leaves.

- radices crassae fasciculato-fibrosae, amethystini coloris, fibrillis luteis (DeCandolle), the roots thick, fasciculate-fibrous, of an amethystine color, with the fibrils yellow.

silky, “covered with shining, close-fitting fibrils; sericeous” (S&D); see silky.