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Tort . Ttigida, Rigid Screw-moss ; with very short 
stem ; spreading, stiff, blunt leaves, rolled inwards, and 
without nerves ; caps, cylindrical and lid conical. On 
rocks, banks, and walls. Bryum Rigidum of Wither- 
ing, Hudson, and others. 
Tort. Ruralis Great Hairy Screw-moss ; with 
branched stem ; leaves blunt, recurved, hairy at the 
summit ; upper leaves star-shaped ; capsule ovate, cy- 
lindrical. Common on walls, cottages, and trunks of 
trees. Bryum RuraleoS Spec. Plant. Witheringand others. 
Tort. Subulata , Awl-shaped Screw-moss ; with 
short, somewhat simple stem ; leaves ovate, lance- 
shaped, pointed ; caps, cylindrical, and lid awl-shaped* 
upright. Common in moist shady places, but rare in 
the northern districts of Britain. JBryum Subulatum of 
Spec. Plant. Hudson, Withering, Lightfoot, &c. 
Tort. Muralis, Wall Screw-moss ; with very short, 
nearly simple stem ; leaves ovate, sharp, hairy; caps* 
elliptic, cylindrical, and lid conical. One of the most 
common mosses; on walls and houses. Bryum Mu* 
rale, Spec. Plant.. 
Sect. III. With Double Fringes 
Orthotrichum. Gen . char. — Caps, oblong, ten- - 
minal ; external fringe, with sixteen teeth ; internal* 
with eight or sixteen thread-shaped teeth, and some- 
times none ; ealyptra often rough, with straight hairs, 
angular. 
Orthot. Striatum, Common Bristle-moss ; with 
branched stem ; leaves lance- shaped, keeled, bent-back, 
spreading ; ealyptra entire, and internal fringe with 
