ruiiiruuiuiu. 



*. lieplsoras. Main veins indistinct, not rarely wanting. 

 **. Pleui-idlnm (incl. Microsorium). Main veins distinct nearly or 

 quite to the edge. 

 c. Chrysopteris. Rhizome and scales as in A. Fronds lobed, pin- 

 natifid or pinnate. 



*. Phymatodes. Fronds stipitate, lobed or pinnatifid. 

 **. Phymatopsis. Fronds stipitate, pinnate. 

 *♦*. Drynarlopsls. Fronds sessile, lobed, pinnatifid or pinnate. 



Fertile segments not contracted. 

 *♦**. Aglaomorpha. Like ^i-^^ but the sori restricted to the much 

 contracted higher segments. 

 7. SELLIGUEA. Venation as in § 6. Sori linear or linear-oblong, more 

 than 3 X as long as broad, continuous or interrupted, rarely abbrevia- 

 ted or round, more or less oblique to the costa. Fronds simple or 

 pinnate. Hk. Bk., 1. c, tab. VI, fig. 52, e— f. (*) 



Key lo the malayan sections and groups. 



a. Veins quite free. 



h. Sori superficial, or immersed in dorsal or submarginal pits, but not 

 as in h.h. % 1. EUPOLYPODIUM. 



c. Fronds simple, lobed, pinnatifid or forked. 



d. Fronds simple. § 1, a. Integrifoliae. 



d.a. Fronds lobed or pinnatifid. § 1, c. Pinnatifidae. 



«l.«i.«l. Fronds 1—2 X forked. § 1, b. Furcatae. 



C.C. Fronds + pinnate or more compoundly divided. 



*. Fronds pinnate, the pinnae distinct or slightly confluent at 



the base. § l> <!• Pinnatac. 



*.*. Fronds at least 2-pinnatifid. § 1, e. Compositac. 



h.h. Sori immersed in saccate or indusium-like, marginal or submarginal 



depressions. Fronds simple to deeply pinnatifid. § 2. PROSAPTIA. 



a.a. Veins free, forked, the anterior branch of the veins not rarely reaching 



to the posterior branch of the next higher vein so as to form a row of 



regular costular areolae; the posterior veinlet always free towards the 



margin of the frond. Fronds deeply pinnatifid. P. Cesatlanum, Bk. 



a.a.a. Veins anastomosing more or less copiously. 



(*) This section would perhaps better be treated as a distinct genus. 



