Victorian Plants. 519 



2164. Fronds much paler beneath. 



Tall, glabrous ; root-stock widely creeping ; stemlike stalks 

 scattered ; fronds very ample, pale- or greyish-green, 

 without any lustre ; segments mostly semi- elliptical, 

 without any denticulation, confluent at the base, the 

 uppermost segments gradually passing into the attenuated 

 short-lobed end of the pinnule ; venules scarcely or im- 

 perfectly reticulating ; spore-caselets placed on a filiform- 

 linear axis. P, incisa. 



Fronds hardly paler beneath. 



Tall, sometimes slightly beset with minute hairlets ; fronds 

 very ample, dark-green ; upper pinnules somewhat 

 decurrent; segments from semi-elliptical to semi-lanceolar, 

 confluent at the base, often denticulated at the summit ; 

 venules completely reticulating ; spore-caselets placed 

 on a filiform-linear axis. P. co mans . 



X.01KARIA. 



2165. Fronds all or some undivided. 



Seldom tall; frond -stalks short; sterile fronds or their seg- 

 ments narrowly elongated -lanceolar, rigid, shining, dark- 

 green, entire or slightly denticulated, pointed at the 

 summit ; fertile fronds or their segments broad-linear, 

 also rigid, rather acute ; segments of neither kind of frond 

 numerous. L. Fatersoni. 



2166. Fronds rather flaccid ... ... ... ... ... 2167 



Fronds rather firm or quite rigid ... ... ... 2168 



2167. Fronds extensively pinnate. 



Often rather dwarf, scantily beset with pointed narrow 

 scalelets ; fronds rather narrow in proportion to their 

 length, short-stalked, hardly paler beneath, pinnate in 

 their lower portion, pinnatisected in the upper ; segments 

 of the sterile fronds membranous, from almost oval to 

 elliptical, the lowest segments gradually much abbreviated; 

 segments of the fertile fronds mostly linear-elliptical. 



L. fluviatilis. 

 Fronds pinnatisected throughout. 



Rather dwarf, glabrous, sometimes forming a very short 

 trunk ; fronds lanceolar in outline, somewhat membranous, 

 hardly paler beneath ; segments of the sterile fronds 

 mostly semi-lanceolar, adnate at the base, rather pointed, 

 hardly denticulated, conspicuously venular-streaked, the 

 lowest shortened to a roundish or even semi-orbicular 

 form ; segments of the fertile fronds broad-linear. 



L. lanceolata. 



