SPECIES AND VARIETIES OF BRITISH FERNS. 23 



Var. spinulosa. Fronds oblong-lanceolate, bipinnate, 

 with spinulose serratures ; posterior pinnules much 

 largest ; scales ovate, pale. 



6. L. dilatata. Fronds oblong, or ovate-lanceolate, bi-tri- 



piunate, with spinulose serratures ; scales lanceolate. 



Var. dumetorum. Fronds oblong-ovate or ovate-trian- 

 gular, dwarf, very glandular; scales pale, two- 

 coloured, narrower. 



Var. collina. Pinnules ovate, blunt, bluntly mucron- 

 ate-serrate scales dark-centred. 



Var. Clianterice. Fronds lanceolate, narrowed below, 

 and caudate at the apex ; pinnae and pinnules dis- 

 tant. 



Var. glandulosa. Fronds lanceolate-ovate, tall, very 

 glandular ; scales pale two-coloured, broader. 



7. L. cemula. Fronds triangular, bipinnate, pinnules con- 



cave above ; scales lanceolate, laciniated. 



Genus 6. ATHYRIUM, Roth. 



1. A . Filix-foemina. The only British species. Fronds bi- 

 pinnate ; pinnules flat, linear-oblong, lobed. 



Var. rhceticum. Pinnules narrow, distinct, linear, 



convex, lobed. 



Var. latifolium. Pinnules broad ovate, crowded, irre- 

 gularly lobed. 



Var. marinum. Fronds narrowed to the base, de- 

 cumbent, pinnules oblong, with simple marginal 

 teeth, rachis winged. 



Genus 7. ASPLENIUM, Linnceus. 



1. A. septentrionale. Frond linear-lanceolate, two-three- 



cleft. 



2. A.germanicum. Fronds linear, alternately pinnate, pinnae 



narrow wedge-shaped ; indusium entire. 



3. A. Euta-muraria. Fronds bipinnate, pinnules wedge- 



shaped at the base ; indusium jagged. _ 



4. A. viride. Fronds linear, pinnate, rachis green above. 



5. A. Trichomanes. Fronds linear, pinnate, rachis black 



throughput. 



Var. incisum. Pinnas deeply lobed. 



6. A. marinum. Fronds pinnate, rachis winged. 



7. A. fontanum. Fronds bipinnate, narrow lanceolate, 



rachis winged, smooth. 



8. A . lanceolatum. Fronds bipinnate, broad lanceolate, rachis 



not winged, scaly. 



