162 CHARACTERS OF TRIBES AND GENERA. 



above. Sterile pinnules oblong, elliptical, oblique sub- 

 cordate, serrulate, 1 to 1J inches in length. Veins forked ; 

 venules free. Fertile pinnules linear, 2 to 3 inches long, 

 revolute, margins conniving and forming an universal 

 indusium. Sporangia occupying nearly the whole length 

 of the short venules, forming linear forked confluent sori. 



Type. Llavea cordifolia, Lagasca. 



Illust. Hook, and Bauer, Gen. Fil., t. 36 ; Moore Ind. 

 Fil., p. 53, A. ; J. Sm. Ferns, Brit, and For., fig. 52 ; 

 Hook. Syn. Fil., t. 3, fig. 28. 



OBS. This genus is founded on a Fern which I originally 

 described in Hooker and Bauer's "Genera Filicum" as a 

 new genus, under the name of Ceratodactylis, without at 

 the time being aware that it had been previously described 

 under the name of Llavea, by Lagasca. In habit the sterile 

 portion of the frond resembles Osmunda regalis, and the 

 fertile pinnules by their revolute membraneous margins, 

 have much the character of the fertile pinnae of Strutldop- 

 teris and Allosorus, while the forked linear sori gives it a 

 claim to be associated with Gymnogramma. 



Sp. L. cordifolia, Lag. (v v.) (Ceratodactylis osmundioides, 

 J. Sm. Hook, and Bauer, I. c.). 



This Fern has only been found near Oaxaca in Mexico. 



73. PLAGIOGTRIA, Mett. (1858). 

 Lomaria sp. Hook. Sp. Fil. 



Vernation fasciculate, erect, acaulose, naked. Fronds 

 pinnate, l to 2 feet high, dimorphus ; stipes 3 or 4 

 sided, thickened at the base, and furnished with spongy 

 glands ; sterile pinna3 4 to 6 inches long, lanceolate acu- 

 minate, sessile or with a short petiole and articulate with 

 the rachis. Veins simple or forked. Fertile frond con- 



