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b. Pinniilae pectinate-serrulate ; tootlilets cartilagineous. 



(8) A. cartilagidens. 



bb. Pinniilae entire, cretnilate, serrulate or denticulate ; tootlilets not 

 cartilagineous. 



c. Main rachis very setose-squainose. (9) A. ferox. 



cc. Main rachis not very setose or squainose. 



d. Pinnulae subulate-lanceolate or elongate-triangular from a 

 broad base. (10) A. Teysmanniana. 



c/d. Pindulae linear, linear-lanceolate, linear- oblanceolate or 

 elliptical, the base not or hardly broader than the 

 middle. 



e. Recurrent venules absolutely wanting, 

 f. Pinnulae entire or siibentire. 



g. Sori absolutely marginal. (11) A. Brooksii. 



g'g. Sori not marginal. (12) A. Lorentzii. 



//. Pinnulae not entire. 



g. Crenulate or crenate. (13) A. Ruttenii. 



gg. Not crenulate or crenate. 



h. Serrulate or serrate. (14) A. crassipes. 



hh. Dentate or denticulate. (15) A. amboinensis. 

 ee. Recurrent venules present though not rarely short, indis- 

 tinct or hidden. 



f. Pinnulae on stalks to ± 10 mm. long.{lö) A. Presliana. 

 //. Pinnulae sessile or on stalks to ± 5 mm. long, 

 g. Pinnulae beneath minutely tomentose throughout. 



(17) A. aphanosorus. 

 gg. Pinnulae beneath naked or at best sparingly chaffy 

 or lanuginoso-squamulose. 

 h. Pinnulae beneath black-sqiiamulose. 



(18) pallescens. 

 hh. Pinnulae beneath not black-squamulose. 



/. Sori absolutely marginal. (19) A. angustata. 

 //. Sori not marginal, sometimes apparently so 

 when the margins of the pinnulae are much 

 recurved. 



k. Acumen of the pinnulae coarsely serrate 

 . ; throughout; pinnulae conspicuously narrow. 



(20) A. caiidata. 

 kk. Acumen crenulate or serrulate, at best 

 serrate at the base, or the pinnulae not 

 conspicuously narrow. 



