74 Mr. M r. n z r e i ' s Arrangement of the 



cafyptra is of a deep ferruginous colour, and about a third part 

 longer than the inner one. 



I was favoured with this fpecies by Mr. Dickfon, who collected 

 it on Ben Nevis in Scotland, about half way up the mountain. I 

 alfo received the fame from Dr. Swartz of Stockholm, who lately 

 difcovered it in Sweden. His fpecimen has the lower leaves and 

 calyptra black, which I confider only as accidental diftindions. I 

 was at firft inclined to confider it as a variety of P. attenuatum ; but 

 its (lender appearance, its leaves being fhorter, ereclr, and thinner 

 fet, and the difference in the form of its capfule, induced me to 

 make it a diftincT: fpecies ; and 1 have fome doubts whether it may 

 not be the fame which Dillenius has figured in Tab. 54. fig. 2. I 

 have not however ventured to quote that figure till I am enabled 

 to remove my doubts by a fight of Dillenius's fpecimen. Both this 

 and the foregoing are to be diftinguifhed from P. commune by their 

 carinated leaves, with ftrong whitiih middle nerves, by having no 

 membranaceous leaves round the bafe of their peduncles, and no 

 apparent apophyfis at the bafe of their capfules. 



9. Polytrichum commune^ fol. lineari-lanceolatis acutis ferrulatis 

 capfula quadrangulari, apophyfi fubjecla. 



P. commune Linn. Sp. PI 1573. Bill. Mufc. 424. /. 54./. 1. 

 P. /erratum Schranck Fl. Bav. 2. 446. //. 1371. 

 Hab. in fylvisy et ericetis humidis. 



Thefialk is ere£t, from two to five inches and upwards in height. 



The leaves are ftifT, linear-lanceolate, ending in acute hifpid points 

 and finely ferrulated on their edges: they are of a bright green 

 colour when frefh, but of a reddifh brown when dried or in decay : 

 thofe on the top of the ftalk, furrounding the bafe of the peduncle, 

 differ from the others in being more ere&, whitifh, membranaceous, 



and 



