62 
HISTORY OP BRITISH FERNS. 
Genus Q. SCOLOPENDRIUM, 
i 
1. S. vnlgare, Symons . — The only British species. Fronds 
strap-shaped, entire. Plate XV. fig. 1. 
mr. polyschides. — Fronds long, narrow, irregularly 
lobed, fertile. 
mr. marginatum. — Fronds long, narrow, lobed, with a 
double, i.e. split margin, fertile. 
mr. crispum. — Fronds elongated, much undulated at 
the margin, usually barren. 
mr. multifidum. — Fronds usually shortened, multifid 
and tasselled at the apex ; barren or fertile. 
mr. laceratum. — Fronds broad, short, with the margin 
lobed, the lobes multifid-crisped ; fertile. 
POLYPODIACE^ § LoMARIE^. 
Genus 10. BLECHNUM^ Linnceus. 
1. B. Spicant, — The only British species. Plate 
XVI. fig. 2. 
mr. ramosum. — Fronds branched, the extremities of 
the branches tasselled. 
