438 CYSTOPTERIS MONTANA. 



dividing Glen Dochart and Glen Lochy. More recently Mr. 

 J. Backhouse has found it in Canlochen, at the head of Glen 

 Isla, Clova, in Fifeshire. 



It grows on mica schist in moist alpine situations, and is one 

 of our rarest British Ferns. 



It is found abroad in Laj^land, Norway, Sweden, Denmark, 

 France, Germany, Sjjain, Italy, Switzerland, Hungary, Kamts- 

 chatka, and in the Rocky Mountains. 



Caudex creeping. Stipes slender, and longer than the frond; 

 sjjaringly scaly, and dark coloured at the base. Hachis and 

 rachides narrowly margined above. 



Length of frond from four to twelve inches, the leafy portion 

 being only three or four inches; deep green in colour, smooth, 

 triangular in form, and tripinnate. Pinnae ascending, the basal 

 pair very much the largest, being as much as two inches and 

 a half in length. Obliquely ovate, the jDosterior jjinnules double 

 the length of the anterior j)innules. The lower j)innffi unequal- 

 sided. 



The larger pinnules pinnate, the others pinnatifid. Lobes 

 oblong-ovate, with bidcntate acute teeth. 



Sori medial and indusiate, covering the whole of the imder 

 surface with roundish spore-cases. 



Indusium thin and transj^arent. 



Costa nearly straight, with alternate veins, one in each lobe. 



In cidtivation this plant should be grown in a shallow pan, 

 using an ojjen compost, mixed with sjjhagnum, coarse sand, 

 and fragments of charcoal or stone. It requires abundance of 

 moisture, yet cannot endure stagnant water. 



There arc no varieties. 



