POLYPODIUM ROBERTIANUM. 89 



upright, lateral, adherent to a scaly creeping rhizoma; colour of 

 fronds a dull greyish green. 



Stipes often occupying two-thirds of the length of the frond; 

 rachis glandulose; rhizoma much branched. Both the stipes and 

 frond covered with small glands, which give the plant a dusty 

 appearance. 



This Fern differs from P. di^yopteris in having the divisions 

 of the frond pinnate instead of ternate. 



Not subject to variety from spores. 



I am indebted to Mr. Joseph Sidebotham, of Manchester, and 

 the Rev. W. Miller, late Curate of Wirksworth, for plants of 

 this species. 



It is in the catalogues of Sim, of Foot's Cray; Osborn and 

 Sons, of Fulham; Kennedy, of Covent Garden; A. Henderson, 

 of Pine-apple Place; E. G. Henderson, of St. John's Wood; 

 Parker, of Holloway; Rollisson, of Tooting; J. Veitch, Jun., of 

 Chelsea; Bass and Brown, of Sudbury, Suffolk; and Pearson, 

 of Chilwell, near Nottingham. 



The illustration is from a plant in my own collection, and 

 formerly gathered wild at Matlock. 



