Genus Polytrichum ; withfome Emendations, 8 1 



caljptra is of a ferruginous colour, and^about twice the length of the 

 inner one. 



This is in Sir Jofeph Banks's Herbarium, and was firft brought 

 from the north-weft coaft of America by Mr. Nelfon, who accom- 

 panied Captain Cook in his laft voyage. I have fince frequently 

 met with it myfelf in the pine-forefts on the fame coaft j but it has 

 not been found, to my knowledge, any where elfc. 



16. Polytrichum urnigerum, fol. lanceolatis acuminatis denticulato- 

 ferratis rigidis, capfulis cylindricis ereclis. 



P. urnigerum Linn. Sp. PI. 1573. Dill. Mufc. 427. /. 55. f. 5. 



Habitat in ericetis montojis Anglicc^ &c. 



This grows from an inch to three inches in height ; the lower part 

 of the Jialk is naked, but the upper part is crowded with leaves, 

 and generally divided into numerous branches. — The leaves are 

 lanceolate, iharp-pointed, rigid, and irregularly ferrated with acute 

 dents. — The peduncles are about an inch or an inch and half long, 

 and arife pretty copioufly from the fummits of the lower branches, 

 and not from the axillae of the leaves, as they have been generally 

 defcribed : the vaginal perichatium, which clofely furrounds the bafe 

 of each, is about an eighth of an inch in length. — The capfule is cylin- 

 drical and erect, having the rim wide, and fringed with minute dents. 

 The operculum is flat, with a fmall point in the centre, and covers the 

 rim with a thick obtufe edge. — The exterior calyptra is fmall and 

 fubulate, of a light ferruginous colour at the top, but whitifh to- 

 wards the bottom, and is rather more than twice the length of the 

 inner one. 



Vol. IV. M T7. Po- 



