92 rOLYPODlUM SIMPLEX. 



edge; cordate at the base, and subhastate. Lateral, being 

 adherent to a scaly creeping rhizoma. 



Sori linear, medial, in some degree transverse, arcuate, and 

 continued across the junction of two anastomosing venules; 

 eventually confluent. Colour brown. 



Veins pinnate, curved, and almost parallel; conspicuous, 

 dividing the frond into a multitude of rectilinear parallelo- 

 grams. 



Length of fronds from six to twelve inches; colour a dull 

 green. 



For fronds I am indebted to Sir W. J. Hooker, Director 

 of the Royal Gardens, Kew; Mr. J. Smith, Curator of the 

 Royal Gardens, Kew; and to Mr. R. Sim, of Foot's Cray. 



It may be procured of Mr. R. Sim, of Foot's Cray, and 

 Messrs. Booth, of Hamburg. 



The illustration is from a barren frond forwarded by Mr. 

 J. Smith, of Kew. 



