A Grammatical Dictionary of Botanical Latin

fibrillosus,-a,-um (adj.A): fibrillose, covered with firm thin fibers, ‘hairy;’ in Sphagnum, with fine, fiberlike wall thickenings (fibrils) in hyaline cells of leaves and occasionally cortical cells; (in fungi) “covered with silk-like fibers” (Ainsworth & Bisby); (in fungi) “(of the surface of the pileus or the stipe) having hairy filaments which are thin and threadlike, arranged more or less parallel to one another, compactly or scattered; distinguished from ‘tomentose’ or ‘subtomentose’” (S&D);

- volva crebre fibrillose vel membranacea, with the volva closely hairy (fibrillose) or membranous.

- pileus laevis , vix fibrillosus , neduin villosus (S&A), the pileus smooth, scarcely fibrillose, much less villous.

- cortina fibrillosa vivide cinnamomeo - ferruginea persistentiore (S&A), with the cortina more persistent, fibrillose, brightly cinnamom-rusty red.

- stipes crassus , teres , solidus, infra veli locum plus minus fibrillosus, stipe thick, round, solid, below the place of the veil more or less fibrillose.

- caule erecto glaberrimo ad collum fibrilloso (DeCandolle), with the stem erect, very glabrous, fibrillose at the collum [=neck].

- caule erecto ad collum fibrilioso (DeCandolle), with the stem erect, fibrillose at the collum [=neck].

- herba aquatica radicibus fibrosis humo adfixa (DeCandolle), an aquatic herb attached to the soil by fibrous roots.

- [fungi] pileus obsolete zonatus, squamuloso-fibrillosus , valde rivulosus , disco demum fere nlger (S&A), the pileus faintly banded, squamulose-fibrillose [i.e. minutely scaly and with thin, firm fibers], strongly rivulose [i.e. with fine, irregular grooves], with the disc finally almost [shining] black.

Leccinum fibrillosum Smith, Thiers & Watling: a mushroom with dry matted hairs on the cap, concentrated into coarse, small scales.