64 HISTORY OF BRITISH FERNS. 
3. C. montana, Link. —Fronds triangular, tripinnate. Plate 
XIY. fig. 2. 
POLYPODIACE2E § PERANEMEjE. 
Genus 14. WOODSIA, B. Brown. 
1. W. ilvensis, B. Brown. — Fronds lanceolate, hairy- 
squamous ; pinnae oblong, lobed. Plate III. fig. 2. 
2. W. alpina, Gray. —Fronds linear, almost smooth ; pin¬ 
nae bluntly triangular, lobed. Plate IY. fig. 1. 
POLYPODIACEiE § HyMENOPHYLLE.®. 
Genus 15. TRSCHOMANES, Linnaeus. 
1. T. radicans, Swartz. —The only British species. Plate 
XVIII. fig. 1. 
Genus 16. HYMENOPHYLLUM, Smith. 
1. H. tunbridgense, Smith. — Pinnae vertical, involucres 
compressed, serrate. Plate XY. fig. 2. 
2. H. unilateral, Willdenow. —Pinnae deflexed, involucres 
inflated, entire. Plate XV. fig. 3. 
Osmund ACEiE. 
Genus 17. OSMUNDA, Linnaeus. 
1. 0. regalis, Linnaeus. —The only British species. Plate 
XIX. fig. 2. 
