SPECIES AND YARIETIES OF BRITISH FERNS. 61 



4. A. viride, Hudson. — Fronds linear, pinnate, rachis green 



above. Plate XIII. fig. 4. 



5. A. Trichomanes, Linnwus. — Fronds linear, pinnate, ra- 



chis black throuo-hout. Plato XIII. fis". 5. 

 var. incisnm. — Pinnas deeply lobed. 

 var. cristatum. — Fronds tasselled at tlic end. 

 G. A. marinum, Linnwus. — Fronds pinnate, rachis winged. 



Plate XIV. fig. 1. 



7. A. fontanum, R. Brown. — Fronds bipinnate, narrow 



lanceolate, rachis winged, smooth. Plate XIII. 

 fig. 2. 



8. A. lanceolatum, Hudson. — Fronds bipinnate, broad 



lanceolate, rachis wingless, scaly. Plate XII. fig. 1. 

 Tar. microdon. — Pinnte only lobed or subpinnate at the 

 base, wavy. 



9. A. Adiantum-nigruin, Z//»2«?/^. — Frond bipinnate, tri- 



angular ; segments wedfre-oblong. Plate XII. fif*;. 2. 

 Tar. acutum. — Fronds tripinnate, triangular, much 

 acuminate ; seo-rnents linear. Plate XXII. fig. 2. 



Genus S. CETERACH, Willdenow. 



1. C. officinamm, Willdenow. — The only British species. 

 Plate I. fig. 1. 



