89. POLYPODIACE^E. 205 



smooth, tender bright greeD, ternate, divisions pinnate, the two 

 lateral and lower portions not so large as the terminal one, on 

 slender stalks ; segments obtuse ; slightly crenate. Sori near the 

 margin. 



Frequent. On dry shady banks. (S) P. 7. Cadzow, on the banks of the Avon, 

 plentiful; near Cambuslang; banks of the Calder ; banks of the Kelvin ; Dougal- 

 ston ; Gourock to Arran. 



2. CRYPTOGRAMME. Rock-brake. 



C. CRISPA, Br. Parsley -fern, Curled Rock-brake. Rhizome 

 densely tufted. Stipes long, brittle. Fronds 6 12 in. high. 

 Barren ones bi-tripinnate, segments wedge-shaped, deeply-toothed 

 at the apex. Fertile fronds linear-oblong, obtuse, entire, margin 

 recurved. Sori circular, covered by the margin of the frond. 

 Plant resembling a tuft of parsley. 



Not common. Amongst rocks in mountainous countries. (H) P. 7. Ben 

 Lomond; Neilston pad; 10 miles along the Drymen road ; "hills above Kilrmin," 

 Wm. Simpson ; Glen Sannox, Arran ; Campsie hills. 



3. AsrfDiUM. Shield-fern. 



A. POL^STICUM. Indusium orbicular, attached by the centre 

 (peltate). 



1. P. ACULEATUM, Sw.Common Prickly Shield-fern. Rhizome 

 short, thick, covered with the remains of former years' stipes. 

 Fronds with short chaffy stipes, broadly lanceolate, bipinnate; 

 pinnules obliquely curved, tapering to a wedge-shaped base, 

 forming an acute angle, very shortly stalked, lower one on the 

 upper side next the main rachis longer than the others, upper base 

 enlarged into an auricle ; margins serrate, spinulose ; rachis chaffy. 



Frequent. Woods and hedge banks. (E) P. 7. Galdenvood glen; below 

 Gourock; Bute and Arran. 



Var. lobdtum. Frond narrower than the last, more rigid, with 

 scarcely any footstalk to the pinnules, ''when starved pinnate,'* 

 often with the margin strongly spinose. 



Common. Moist woods and shady banks. (B) P. 7. Hamilton; Calderwood 

 glen; Cambuslang glen; Cathcart; Crofthead; Kelvindock; from Gourock to 

 Arran. 



2. P. ANGULA.RE, Willd. Angular-leaved Shield-fern, Rhizome 

 short, thick. Stipes short and chaffy. Fronds 2- 3 ft. high, 

 flexible, distinctly bipinnate ; pinules next the main rachis scarcely 

 larger than the rest, all lobed on the upper side, obtuse or acute, 

 deeply serrate, spinulose ; base forming an obtuse angle, distinctly 

 stalked, lying more at right angles to the rachis than the former ; 

 altogether a more luxuriant plant. 



Not common. Woods and hedge banks. (E) P. 7. Helensburgh; Woods at 

 Skelmorlie very plentiful; several glens below and towards Largs; Cuinbrae; 

 Bute and Arran. 



