187 239 
rachis and coste beneath. It is excellently described by METTENIUS and I add here 
only the following comparative remarks. 
The short-creeping rhizome is at the apex rather densely clothed with ovate, 
brown, stellato-pilose scales. The strong stipes are up to 4 dcm long, and like the 
rachis and coste beneath furnished with some small, brown scales. The rachis is 
minutely pulverulent by stellate hairs, and the coste of both sides bear a few long 
hairs, otherwise the la- 
mina is practically gla- 
brous. Lamina 6—7 dcm 
long, 2—3 dcm broad, 
upwards rather suddenly 
narrowed into a pinnati- 
fid apex. Pinne 15 cm 
long, 2!'/»—3 cm broad, 
the lower ones shortly 
stalked and their base 
distinctly cuneate but 
shorter than in D. tristis, 
the upper ones sessile 
with truncate base, their 
basal segments somewhat 
abbreviated. Pinnz inci- 
sed a little above the 
middle into close, sub- 
faleate, acute or often 
submucronate segments, 
5 mm broad. Veins sim- 
ple, 9—10-jugate, the ba- 
sal ones connivent to si- 
nus. Sori medial, fur- 
nished with a small, de- 
ciduous, ciliate indusium. 
— Texture membranous, 
colour dark- or greyish 
green, generally brown Fig. 33. D. monosora (Pr.) C. Chr, leg. Pont, Base of basal 
when dried, surfaces of- pinna, base and apex of a middle pinna and apex of a leaf >< */s; 
in shining segments seen from both surfaces >< 1!|». 
The nearest Brazilian relative of D. monosora is D. scabra, which is smaller 
and has all the pinnz sessile, their base not cuneate, entire; further it has fewer 
veins, of which only the basal pair run to sinus. 
D. monosora seems to be restricted to the forests of Rio and Sao Paulo; it 
occurs in two forms: 
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31* 
