SPECIES AND VAEIETIES OF BRITISH FERNS. 61 
4. A. viride, Hudson, — Fronds linear, pinnate, rachis green 
above. Plate XIIL fig. 4. 
15. A. Trichomanes, Linncuus, — Fronds linear, pinnate, ra- 
chis black throughout. Plate XIIL fig. 5. 
mr, incisum. — Pinnae deeply lobed. 
mr, cristatum. — Fronds tasselled at the end. 
6. A. marinum, Linnceus, — Fronds pinnate, rachis winged. 
Plate XIV. fig. 1. 
7. A. fontanum, It, Brown, — Fronds bipinnate, narrow 
lanceolate, rachis winged, smooth. Plate XIIL 
fig. 2. 
8. A, lanceolatum, Hudson, — Fronds bipinnate, broad 
lanceolate, rachis wingless, scaly. Plate XIL fig. 1. 
mr. microdon. — Pinnae only lobed or subpinnate at the 
base, wavy. 
9. A. Adiantum-nigrum, Linnceus. — Frond bipinnate, tri- 
angular ; segments wedge-oblong. Plate XIL fig. 2. 
mr. acutum. — Fronds tripinnate, triangular, much 
acuminate ; segments linear. Plate XXII. fig. 2. 
Genus 8. GETE.RkC\\, Willdenow. 
L C. officinarum, Willdenow.' — The only British species. 
Plate 1. fig. 1. 
