POI.YropiUM YULGARE. 37 



it to be Sedum acre in bloom. Tlie apical lobes are rough, 

 abnost papillose on the upper surface, the protuberances being 

 caused by the large spore-cases. The epidermis, where not 

 clad "with the fructification, seems quite separated from the 

 upper skin, and, as the discoverer says, readily wrinkles — a 

 peculiar feature. It still grows plentifully at Low Hutton. 



Crenatum, Mo(yre. (Fig. 16.) — Gathered near Ruthin, by 

 Mr. Pritchard; Conway Castle, by Dr. Allchin and Mr. Stans- 

 field; Devonshire, by Mr. Hillman; Saltwood, by Mr. Gray; at 

 ^lucruss, Ireland, by Dr. Allchin; and on Carberry Island, near 

 Atlilone, by Captain A. S. H. Lowe. Much larger than the 

 ordinary form, and much thinner in texture. The fronds are 

 broad and ovate. The margins of the lobes obscurely crenated 

 or crenato-lobate ; frequently undulated. A most interesting 

 variety, but inconstant, often running into Serratuiii, and 

 ultimately becoming Semilacerum. Sori sometimes oblong. My 

 brother found both Semilacerum and Crenatum growing together 

 on Carberry Island. 



Cristatum, Perry, MS. (Plate VII — A.) — Discovered in 

 Ireland by Mr. Henry S. Perry, of Rock Lodge, Monkstown, 

 County Cork. First figured in my "Natural History of Xew 

 and Rare Ferns," Plate XXVI — B, and described on page ^Z 

 of that work. Mr. R. Sim, of Foot's Cray, having purchased 

 the stock of this very distinct variety; it is therefore now 

 finding its way into collections. 



The present plant has multifid or tasseled apices to every 

 pinna, the midvein of each 'being divided and branching about 

 a quarter of an inch below the apex. The rachis is also 

 divided and bifid about an inch below the apex of the frond. 

 The variety Cristatum, from the points of each frond beino- 

 branched and crested, and all its divisions terminating in 

 crested tufts, so as to form a frilled margin, is both distinct 

 and beautiful. The sori are large and prominent, coveriu"- 

 the whole under side of the upper half of the frond quite to 

 the apex. When first discovered, Mr. Perry forwarded me a 

 frond with a small portion of rhizoma attached: this was 

 planted, and grew, and is still quite true to its original 

 character. Length from six to nine inches. 



