187 



239 



rachis and costæ 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 dem long, and like the 

 rachis and costæ beneath furnished with some small, brown scales. The rachis is 

 minutely pulverulent by stellate hairs, and the costæ of both sides bear a few long 

 hairs, otherwise the la- 

 mina is practically gla- 

 brous. Lamina 6 — 7 dem 

 long, 2—3 dem broad, 

 upwards rather suddenly 

 narrowed into a pinnati- 

 fid apex. Pinnæ 15 cm 

 long, 2'/3— 3 cm broad, 

 the lower ones shortly 

 stalked and their base 

 distinctly cuneate but 

 shorter than in I), tristis, 

 the upper ones sessile 

 with truncate base, their 

 basal segments somewhat 



abbreviated. Pinnæ inci- 

 sed a little above the 

 middle into close, sub- 

 falcate, 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 

 when dried, surfaces of- 

 ten shining. 



Fig. 33. D. monosora (Pr.) C. Chr., leg. Pohl. Base of basal 



pinna, base and apex of a middle pinna and apex of a leaf X ''lb', 



segments seen from both surfaces X I'lj. 



The nearest Brazilian relative of I), monosora is Ü. scabra, which is smaller 

 and has all the pinnæ 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: 



31* 



