Pares XIX. ХХ. 
URN (Lasrrea CRISTATA). 
THE CRESTED BUCKLER | 
LASTREA, Presl. 
Clusters of Spore-cases eireular, medial or subterminal on the venules, covered by an 
indusium, or membranous scale. Jndusium reniform, ŭe, more or less regularly 
rotundate with a posterior notch; attached by tho sinus or notch, the margin 
ш free. Veins simple, forked, or pinnate; venules direct, disun 
becomin са at 
their extremities 
L. cristata: fronds erect, narrow linear-oblong, sub-bipinnate (or bipinnate); pinna» 
short triangular, with oblong pinnules or segments, which are nearly always 
connected at the base, crenato-serrate, or obscurely lobed, with aristato teeth ; 
ant id. posterior basal pinnules on the lower pinnae nearly equal; scales of 
the stipes ovate, pallid, scattered ; indusium without n 
оре, TI. Deakin, Пит 
Manvel df British Botar 
———— RH 
Desorc eum, 4. rey, M 
Var. vuorsosa: fronds various: early fertile ones tall, erect, narrow, linear-lanecolate, 
mules, 
to, inciso-serrato, or lobed p 
bipinnate below, with ol 
state incurved teeth; barren ones shorter, with oblong bluntish 
oblong bluntish 
having a 
pinnules, adnate or decurrent ; later fertile ones broader, wit 
crenato-serrate pinnules; anterior and posterior basal pinnules of the lowest 
pinnae nearly equal in size 
Var. векова: soo Lasrera sercorosa (Plate XXI). 
EXPLANATION OF THE PLATES. 
