56 
HISTORY OF BRITISH FERNS. 
o. P, alpestre, Sprengel — Fronds bipinnate, lanceolate. 
Plate XXL 
var. flexile—Fronds narrow, flaccid ; pinnae deflexed. 
Genus 2. ALLOSORUS, Bernhardi. 
1. A. crispns, Bernhardi .— The only British species. Plate 
V. fig. 1. 
POLYPODIACEvE § GyMNOGRAMMEjE. 
Genus 3. GYMNOGRAMMA, Desmux. 
1. G. leptophylla, Desmux. — The only British species. 
Plate XXII. fig. 1. 
POLYPODIACE.E § Aspidie^j. 
Genus 4. POLYSTICHUM, Both. 
1. P. Lonchitis, Both. — Fronds pinnate, spiny-serrate. 
Plate IV. fig. 2. 
2. P. acnleatnm, 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. 
