82 
THE FERN WORLD OF AUSTRALIA. 
Deciduous — ^falling off, as the indusia of Aspidium decompositnm. 
decompound — ^having compound divisions. 
decurrent — ^when the base tapers down the stem. 
dentate — toothed. See Aspleninm falcatum. 
dichotomous — in pairs, or forks. See veins of Adiantum. Seg- 
ments of frond of Schizsea dichotoma. 
dimidiate — halved. 
Elongated — lengthened. 
evanescent — disappearing, as the indusia of some Aspidiums. 
exserted — projecting, as the receptacle in many Trichomanes. 
Falcate — curved like the blade of a scythe. See Pteris falcata. 
ferruginous — iron-colored, rusty-colored as the scales on rhachis of 
Dicksonia Youngise. 
fertile — bearing sori. 
filices — ferns. 
filiform — thread-like. See stipes of Schizaea rupestris or Hymeno- 
phylium tunbridgense. 
flaccid — feeble. 
frond — leaf of a fern. 
furcate — forked. 
Glabrous — without hairs. 
glaucous — a hoary gray. 
Hirsute — hairy. See frond of Polypodium Hillii. 
hispid — rough with bristles. 
Indusium — the skin covering the sorus in some ferns. 
involucre — another name for indusium. 
Laciniate — cut or divided. 
lamina — ^blade of leaf or frond. 
lanceolate — lance-shaped. Sometimes applied to general outline. 
lunate — shaped like a half moon. 
Panicle — branched-fructification. See Botrychium ternatum. 
peltate — stalk fixed in the disk instead of the margin. 
petiolule — stalk of leaflet. See Adiantum. 
pinna — leaflet. 
pinnate — leaf divided into leaflets. See Polypodium tenellum. 
pinnatifid — leaf divided into lobes from the margin to near the midrib. 
pinnule — second pinna or leaflet. 
proliferous — when producing young plants upon the frond— as 
Asplenium attenuatum. 
puhescens — downy. See young fronds of Polypodium rigidulum. 
Reniform — kidney-shaped. See indusium of many Aspidiums. 
reticulate — netted. See leaflets of Polypodium rigidulum. 
receptacle — part of vein on which the sorus is seated. 
