•78 POLYPODIUM PHYMATODES, 



than others, and this also holds good wilh the AphldcB. As 

 an instance, the Aphis appears to shun the gold and silver- 

 powdered Ferns of the genus Gymnogramma, yet not of the 

 silver Nothoclilcenas ; there must, therefore, be something in 

 the farina of the former injurious to these insects. If a plant 

 is not enjoying a proper climate or treatment, it seems to be 

 more subject to be infected by insects; for instance, this will 

 be found to be the case with the hardy Scolopcndriums when 

 grown in a greenhouse, the greenhouse species when cultivated 

 in a stove, or the stove species when placed in a greenhouse; 

 also a plant imperfectly drained. We may therefore often learn 

 from the attacks of insects that our management in certain cases 

 is not what it should be. 



This Fern was introduced into England between 1816 and 

 1828, from the West Indies. 



It has been found in both the East and West Indies, New 

 Holland, Mauritius, Malay Islands, and East Indian Islands. 



An evergreen stove species. 



The form of the frond is triangularly ovate, pinnatifid, decur- 

 rent at the base, with oblong-pointed coriaceous segments, which 

 are sometimes six inches in length, the lower one frequently 

 lobed. 



Sori nearly circular. 



Rhizoma creeping, black, and scaly. 



Fronds somewhat erect, glabrous, pale green, and shining, 

 and from twelve to eighteen inches in length. 



Mr. Moore remarks that there are two forms of this Fern in 

 cultivation in England. 



Best known as the Drynaria vulgaris. 



I am indebted to the Curator of the Cambridge Botanic 

 Gardens; Messrs, RoUisson, of Tooting; and Messrs. Masters, 

 of Canterbury, for plants, and to Mr, J. Henderson, of Went- 

 worth; and Mr. Norman, of FIull, for fronds. 



It is in the catalogue of Sim, of Foot's Cray; Masters, of 

 Canterbury; Bollisson, of Tooting; A. Henderson, of Pine-apple 

 Place; Veitch, Jun., of Chelsea; Kennedy, of Covent Garden; 

 and Booth, of Hamburgh. 



The illustration is from a frond forwarded by Mr. Henderson, 

 of Wentworth. 



