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(t) Texture of frond herbaceous, colour 
dark-green, the veins clearly’ 
visible. 
1. A. lunulatum + + ° 
(wz) Texture of frond leathery or almost 
leathery, colour pale-green, veins 
comparatively. obscure. 
1. Pinne more or less lanceolate, 
often caudate. 
2. A. falcatum, 
2. Pinne rather linear-oblong or half- 
ovate. 
3. A. lacinvatum. 
(6) Pinnz with from half to whole of the 
Jower side cut away. . 
4. A. unilaterale. 
II. Fronds 2-4 pinnate, ultimate divisions 
linear. 
(a) Fronds dimorphous. 
5. A. dimorphum, 
(6) Fronds not dimorphous. 
(2) Frond 6-8 inches broad, segment 
distant. 
6, A. viviparum. 
