50 Polypody 
an occasional scale: scales next rootstock similar to those of 
rootstock; those above pale brown, small, lanceolate or linear 
or oblong, pointed, subciliate: fibrovascular bundles three to 
four in base of petiole, the two anterior largest, uniting higher 
up into one wedge-shaped in section or roundish and furrowed 
on face. : 
Blades ovate-oblong or narrowly oblong or rarely lanceolate- 
deltoid, pinnatifid or divided, gradually or abruptly narrowing 
at apex; apex crenate or serrate or at base pinnatifid or at tip 
undulate, obtuse or acute or acuminate, often elongate: seg- 
ments about ten to twenty-three pairs, alternate or opposite, 
mostly separated by acute or rounded sinuses, oblong or oblong- 
linear or oblong-lanceolate, usually obtuse, rarely acute or acumi- 
nate, usually undulate or obscurely serrulate or crenate, rarely and 
abnormally coarsely serrate or variously lobed or pinnatifid: a 
few minute, pale brown or partly colorless, hyaline, linear or ob- 
long, acuminate, ciliate or subciliate scales occasionally borne on 
under surface along rachis and midveins of segments, upper 
surface glabrous or an occasional scale along rachis: rachis 
green or greenish-stramineous, convex on face and back: color 
otherwise olive-green, the under surface pale: texture subcori- 
aceous. 
Venation pinnate, wholly free or with occasional areole: 
primary branches of midveins of leaf’s segments commonly 
once-forked or at apex simple with two simple branches below, 
the lowest branch on upper side sometimes, especially in large 
segments, bearing a few simple or once-forked branches or in 
apices of segments simple: apices of veinlets dilated, oval or 
roundish, visible as straw-colored spots on face of leaf. 
Sori round, borne singly on simple superior basal branches 
