206 



POLYSTICHUM ACULEATUM. 



attenuate. Pinnules equal in size botli above and below, with 

 a larger superior basal pinnule more deeply cut, and especially 

 the auricular lobe; pinnules stalked, except near the apex. 

 Stipes, rachis, and rachides covered with dark brown scales. 

 Vivid green above, paler beneath. Sori very copious, about 

 six pairs of spore-cases on each pinnule. This plant approaches 

 the Polystichum angulare, var. Duhium, but has narrower 

 pinnules, which are more pointed. There is but little diiFerence, 

 the one however, more nearly resembles Polystichum angulare, 

 whilst the other as nearly resembles Polystichum aculeatum. 

 It is unnecessary to give an illustration, as on referring to 

 page 86, fig. 53 will give a good idea of the plant, if it is 

 remembered that the difference consists in the pinnules being 

 narrower and more attenuated. My thanks are due to Mr. 

 Daniels, of Ruthin Castle, Denbighshire, for fronds from 

 plants found in his neighbourhood. 



Fig. 165. 



Plumosum, Lowe. (Fig. 165.)— This feathery-looking form 

 was found near Marwood, by the Rev. F. Mules, to whom I 

 am indebted for fronds. It is normal in outline and size. 

 Differing in the close and elegant i)lumose character of the 

 fronds. 



