56 
HISTORY OF BRITISH FERNS. 
5. P. alpestre, Sprengel — Fronds bipinnate, lanceolate. 
Plate XXL 
mr, flexile.— Fronds narrow, flaccid ; pinnas deflexed. 
Genm 2. ALLOSORUS^ Bernhardi. 
1. A. crispus, BernhardL — The only British species. Plate 
V. fig. 1. 
POLYPODIACEiE § GyMNOGRAMMEJE. 
Genus o. GYMNOGRAMMA, Desvaux, 
1. G. leptophylla, — The only British species. 
Plate XXIL fig. 1. 
POLYPODIACE^ § ASPIDIEiE. 
Genus 4^. POLYSTICHUM, 
1. P. loncMtis, Both — Fronds pinnate, spiny- serrate. 
Plate IV. fig. 2. 
2. P, acnleatum, Both — Frond bipinnate, rigid, pinnules 
ovate-subfalcate, auricled, acute, acutely wedge-shaped 
at the base, nearly all distinct. 
mr. lobatum. — Fronds narrower, pinnules nearly all 
decurrent. Plate IV. fig. 3. 
