194 



The Scottish Naturalist. 



years, and have never observed any tendency in it to revert 

 to its supposed specific type — cristata, nor even to vary 

 markedly from its common form. 

 Athyrium filix-foemina. Common. 



1. Var. laxum. Haughton and elsewhere. 



2. "Var. acrocladon (Wilson). This variety, pronounced by 



Mr. Wollaston to have been previously unknown, was 

 found by Mr. William Wilson (junior) in the immediate 

 neighbourhood of Terpersie. 

 Asplenium Ruta-muraria. Tilliepowrie Castle. Despite 

 some necessary repairs of the old Castle wall a few years ago, 

 entailing the application of large quantities of mortar, this 

 fern continues to thrive on the wall, some fronds being fully 

 six inches long. 



A. viride. Mr. Barclay added this to our local flora, having 



found it on the Hill of Towanrieffe. 

 A. Trichomanes. I have found this near Terpersie, and it 



also occurs at Towanrieffe 

 A Adiantum-nigrum, var. Serpmtini. This lovely Fern is 

 found in Kildrummy. Some plants of it that have been in 

 cultivation for some years are keeping constant to the 

 characters of the variety. 

 Blechnum boreale. Common. 

 Pteris aquilina. Common. 



Var. depauperata variegata. This was found by Mr. Peter 

 Murray in Wellhouse Wood. It exhibited markedly the 

 characteristic features of the variety. 

 Crystopteris fragilis. Den of Craig. 



[0. montana has also been reported from Den of Craig.] 

 Hymenophyllum imilaterale. North side of Bennachie, 

 not far from the summit. 

 The above are the only Ferns of whose existence in the district 

 there is evidence at present ; but there is reason to expect the 

 addition to the list of at least one species — Polypodium alpestre, 

 which has been recorded from so many Scotch localities. Pro- 

 bably it has been overlooked, being mistaken for the very similar 

 Athyrium Filix-foemina, from which it differs, however, in the 

 round sori, devoid of indusium. 



