HYMENOLEPIS. 143 



GENUS VII. 



HYMENOLEPIS. Kaulfuss. 



Another genus represented by a solitary species. 

 Frond linear-lanceolate, the upper portion suddenly contracted 

 and re volute, forming a fertile linear spike. 



Veins, which are internal, are compound-anastomose. 

 Sori linear, confluent longitudinally. 



VOL. II. 



