312 



LASTREA DILATATA. 



the rachis; beyond these all are conspicuously decurrent at the 

 base. In the upper portion of the fronds the pinnules are one- 

 spined and broad-toothed, at the lower part shallowish, broad- 

 lobed, and spiny-toothed. My thanks are due to Mr. Sim for 

 a frond, from which the illustration is taken. 



Fig. 258.— Portion of Frond. 



DiLACERATUM, Stansfield MSS. (Fig. 258.) — Length thirteen 

 inches, width in middle of the frond six inches and a half. A 

 very slender delicate -fronded variety. Pinnae distant, and more 

 or less horizontal, opposite or subopposite; throughout the frond 

 long and narrow, about five pairs, and the ultimate pinna. 

 Pinnules distant, much laciniated, and the anterior and posterior 

 almost equal in size. My thanks are due to Messrs. Stansfield, 

 of Todmorden, for fronds. 



Erosa, Wollaston. — Found at Tunbridge Wells by Mr. G. 

 B. Wollaston, of Chiselhurst, and at Windermere by Mr. F. 

 Clowes. A variety somewhat resembling Collina, but having 

 the dentation of the margin of the pinnules so arranged as to 

 produce the appearance of having been nibbled. Bipinnate, 

 narrow ovate, pinnules distant, oblong obtuse, the lobes serrated, 

 the serratures being bristle-pointed, and frequently curved. The 

 pinnules and lobes unequal in size. 



