CHARACTERS OF TRIBES AND GENERA. 281 



(Sw.) (v v.) ; M. frigida (Lind.) (v v.) ; M. Szovitzii 

 (Fisch. and Meyer). 



This is the only species native of the E. hemisphere, 

 being found in Italy, Dalmatia, Western Asia, and the 

 Himalayas. 



157. ORMOPTERIS, J. Sm. 

 Cassebeera sp., Hook. Sp. Fil. 



Vernation sarmentose. Fronds 1 to l feet long, pinnate, 

 smooth, coriaceous ; pinnaa 2 to 3 inches long, linear, 

 petiolate, deeply cut into numerous quadrangular concave 

 lobes, not exceeding 1 line in breadth, which are incurved, 

 and oppositely connive over the rachis, forming moniliform 

 pinnse. Veins free. Sporangia terminal, few, forming a 

 single sorus seated in the hollow of each lobe, the margins 

 of which are indusoid. 



Type. Cassebeera gleichenioides, Gardn. 



OBS. This genus is founded on a peculiar and remark- 

 able Fern, originally discovered in Brazil by Dr. Gardner, 

 and described in Vol. VI. of Hooker's " Icones Plantarum," 

 under the name of Cassebeera gleichenioides, in which genus 

 it is retained in Hooker's " Species " and " Synopsis Fili- 

 cum," but as it always appeared to me not naturally related 

 to the typical species of Cassebeera, I therefore deem it best 

 to separate it as a distinct genus. In so doing I, how- 

 ever, find it difficult to determine its position in this 

 arrangement, but its small concave indusasform lobes, con- 

 taining the sporangia, seems to indicate affinity with Myri- 

 opteris. 



Sp. 0. gleichnioides (Cassebeera gleichenioides, Gard. ; 

 Hook. Ic. PI, t. 507). 



Native of Diamond district, Brazil. 



