74 Mr, Menzies’s Arrangement of the 
calyptra 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 im Sweden. His fpecimen has the lower leaves and 
ealyptra black, which I confider only as accidental diftin&tions. I 
was at firft inclined to confider it as a variety of P. attenuatum; but 
its flender appearance, its leaves being {horter, erect, and thinner 
fet, and the difference in the form of its capfule, induced me to 
make it a diftiné& fpecies; and 1 have fome doubts whether it may 
not be the fame which Dillenius has figured in Zab. 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 whitifh middle nerves, by having no 
membranaceous leaves round the bafe of their peduncles, coi no 
apparent apophyfis at the bafe of their capfules. 
9. Porytricnum commune, fol. lineari-lanceolatis acutis ferrulatis, 
~ capfula quadrangulari, apophyfi fubjecta. ‘ 
P. commune Linn. Sp. Pl. 1573. Dill. Mufc. 424. t. 54. fo To 
P. ferratum Schranck Fl. Bav. 2. 446. 1. 1371 
Hab. in fylvis, et ericetis humidis. 
The flalé is ereét, from two to five inches and upwards in height.— 
The /eaves are ftiff, 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 ereét, whitifh, membranaceous, 
and 
