57 
(t) Ultimate. segments- not- dimidiate 
_ (ie. halved or. appearing as if one 
half had been cut off), but having 
two or more distinctly opposite 
rows of sori. ’ 
3. A. peruvianum. 
(ii) Ultimate segments dimidiate. 
(1) Stems naked and polished. Ulti- 
mate pinnules 14-2 inches 
Ing. Texture thin. 
4. A. trapeztforme. 
(2) Stems hairy, rough. Ultimate 
pinnules 4-}$ inch long. 
Texture almost leathery. 
5. A. formosum. 
(c) Oligosorous Group.—Frond once or 
more pinnate. Sori more or less continuous on 
either side of the leaflet. 
6. A. macrophyllum. 
. . (a) Capillus-Veneris Group—Frond at 
least bipinnate ; segments fan-shaped with the 
stalk near the centre ; sori oblong or obversely 
‘kidney-shaped. . 
