LASTREA RIGIDA. 215 



There are two forms of growth, one triangular and the other 

 oblong; but the latter form does not seem to be permanent. 



Mr. G. B. Wollaston, of Chiselhua'st, has found a variety in 

 which the fronds, or the pinnae, or both, are more or less 

 multifidly divided at the apex. 



Messrs. Stansfield and Co., of Todmorden, have also procured 

 a ramose variety from Ingleton Fells. 



None of these varieties have proved constant, and cannot 

 therefore be named. 



The illustration is fiom a plant in my own collection. 



