162 CHAEACTEES OF TEIEES AND GENEEA. 



above. Sterile pinnules oblong, elliptical, oblique sub- 

 cordate, serrulate, 1 to 1^ 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. Lhcvea cordifolia, Lajasca. 



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

 FiL, p. 63, A. ; J. Sm. Ferns, Brit, and For,, fig. 52 ; 

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



Oes. — 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 Llarea, by Lagasca. In habit the sterile 

 j)ortion of the frond resembles OsmunJa regales, and the 

 fertile pinnules by their revolute membraneous margins, 

 have much the character of the fertile pinnas of Stntthiop- 

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

 c'aim to be associated with Gi/mnogramma. 



Sp. L. cordifolia, Latj. (v v.) {Ueratodactijlis osmundioides, 

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



This Fern has only been found near Oaxaca in Mexico. 



73.— Plagiogteia, 2Ieit. (1858). 

 Lomaria sp. Hooh. Sp. Fil. 

 Vernation fasciculate, erect, acanlose, naked. Fronds 

 piunaise, li- to 2 feet high, dimorphns ; stipes 3 or 4 

 sided, thickened at the base, and furnished with spongy 

 "lands ; sterile pinnK 4 to G inches long, lanceolate acu- 

 7ninate, sessile or with a short petiole and articulate witli 

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



