834 APPENDIX. 90. AKGIOPTERIS. 



e. Feins beneath pah, opaque. • (5ef) A. crassifolia. 



e.e. Veins beneath black or fuscous. 



f. Pinnulae ± cordate at the base on both sides. 



(5e) A, javanica. 



f.f. Pinnulae not cordate at the base; upper base + 



cuneate, lower + rounded. (3/") A. Hartingeana. 



(og) A. angustifolia. 

 c.c.c. Largest pinnulae under 9 m.M. broad. (5h) A. angustata. 



(3t) A. caudata. 

 6.6. Texture rather thin, membranaceous to papyraceous. 



±. Pinnulae white-waxy beneath. (oj) A. hypoleuca. 



*.*. Pinnulae not white-waooy beneath. 



S. Largest pinnulae less than 14 c.M. long. 



3. Pinnulae + equalrsided at the base. (oA) A. approximata. 

 3.3. Pinnulae distinctly unequal-sided at the base. 

 4L. Upper base narrower than the lower. 



(3i) A. aphanosorus. 

 4.4. Upper base broader than the lower. 



(3m) A. cuspidata. 

 (3n) A. Teysmanniana. 

 2.9. Largest pinnulae more than 44 c.M. long. 



•J-. Pinnulae al least SO c.M. long. (3o) A. Willinckii. 



f.+. Pinnulae at best 20 c.M. long. 



+. Veins beneath pale or indistinct. 



*. Veins oblique. (3/)) A. Presliana. 



{Zq) A. pallesceos. 

 ^.^. Veins rather subhorizontal. (3r) A. similis. 



(3s) A. D'UrviUeana. 

 +.+. Veins beneath fuscous or dark-coloured, distinct. 



(3f) A. microsporangia. 

 (3u) A. ankolana. 

 ai.a. Recurrent veinlets wanting or very short, often hardly visile. 

 6'. Texture thin, rather membranaceous or herbaceous. 



c'. Veins pellucid. (3„) a. amboinensis. 



c'.*?'. Veins not pelludd. (5t„) A. muricata. 



(3a;) A. crassipes. 

 6'.6'. Texture firm, rather chartaceous or coriaceous. (Zz) A. uncinata. 



