308 



LASTREA DILATATA. 



Length of frond sixteen inches, width in the widest part four 

 inches and a half. Pinnse ascending, alternate, about twelve 

 pairs. In the basal pinnae the posterior pinnules double the 

 length of the remainder, and the next three pairs slightly 

 larger, the rest of the pinnaj merely pinnate, the pinnae being 

 remote, and the pinnules small and somewhat ovate, the 

 margin of the pinnnlcs dentate. Pinnules sessile. From the 

 centre of the frond upwards the pinnae varying from half an 

 inch to two inches and a half in length, are only a quarter 

 of an inch wide. Pachis and stipes thin and moderately 

 scaly, the scales being pale in colour. Abundantly soriferous, 

 from four to six spore cases on each pinnule. My ^thanks 

 are due to Mr. Brown for the illustration. 



i:^^Pl>^ 



Fig 253— Middle pinna. 



Grandidens, Moore. (Fig. 253.) — Found in Kent by the 

 E,ev. J. Dix, and at Barnstaple by the late Mr. Jackson. A 

 neat but large-growing variety. Pinnae and pinnules somewhat 

 distant. Pemarkable for the evenly ovate-oblong outline of the 

 pinnules, of which the sides curve inwards at the top to form 

 a scarcely acute apex. This variety is also remarkable for the 

 blunt oblong segments, the pinnules being divided into these 

 segments quite down to the costa, and for having, like collinay 

 a few broad, spreading, conspicuous teeth. 



Smithii, Moore. — From Spike Island. A dwarf form, with 

 more oblong fronds and more equal-sided pinnae than collina. 

 Length of frond twelve inches, stipes three inches. Pinnae of 

 basal half of equal length, with a tapering apex. Form of 



