80 POLYPODIUM PHYLLITIDIS. 



The frond is simple, glabrous, somewhat undulated and nar- 

 row, lanceolate-acuminate in form, being decurrent at the base ; 

 coriaceous. 



Sori medial. 



The length of the frond varies from two feet to two feet and 

 a half. The colour pale green. 



A rigid Fern, differing in habit from the Scolopendrium vul- 

 gare, to which it has been likened by being erect. 



The fronds rise out of a scaly short creeping rhizoma. 



Introduced into England in 1793. 



My thanks are due to Mr. Henderson, of Wentworth, for a 

 plant of this species j and to the same gentleman; to Mr. 

 Norman, of Hull; and to Messrs. Booth, of Hamburgh, for 

 fronds. 



P. phyllitidis may be procured from Messrs. Veitch, of Chel- 

 sea; Sim, of Foot's Cray; A. Henderson, of Pine-apple Place; 

 Kennedy, of Covent Garden; and Booth and Son, of Hamburgh. 



This species is best known in England as the CyrtopJilehium 

 phyllitidis. 



The illustration is from a frond sent by Mr. Norman, of 

 Hull. 



