ClipArt ETC
"A., Filoplume. B., very young feather within its sheath (sh.); c., the core of dermis; b., the barbs. C., the same, external view." -Thomson, 1916

Feathers

"A., Filoplume. B., very young feather within its sheath (sh.); c., the core of dermis; b., the barbs.…

"Filoplume. In ornithology, a thread-feather; a thread-like or hair-like feather, with a very slender stem, lacking webs in most or all of its length." -Whitney, 1911

Filoplume of a Goose

"Filoplume. In ornithology, a thread-feather; a thread-like or hair-like feather, with a very slender…