NOTES ON MOSSES. 137 
lid conico-subulate. A variety B paludosus, from boggy heaths in 
sub-alpine districts is much more robust, 3-4in. high, and with the 
base of the leaves often tinted with purple. 
Two rare species are C. paradoxus, gathered on pearly soil in 
sub-alpine districts, and C. se¢gfolius, found on rocks among grass 
and heath. 
C. atrovirens, the bristly Swan-necked Moss, is common on wet 
rocks and peaty ground on all our mountains, growing in dense 
dark green silky cushions ; stems slender 1-5in. high, repeatedly 
forked. 
Leaves gradually larger towards apex ; erecto-patent, lanceolate- 
subulate ; auricled; nerve dilated, 4+ width of base, sulcate at 
back, excurrent in a long toothed hoary point. Fruit not found. 
Fig. 42. CC. introflexus is a rare species. C. brevipilus, the 
compact Swan-necked Moss, inhabits moist heaths, and is of a 
glossy yellow green. The stems are slender, fragile, 1-3in. high, 
with scarcely any radicles. Leaves narrowly lanceolate-subulate, 
tipped with a short denticulate hyaline point, sometimes wanting ; 
nerve + width of base ; auricles slightly developed. This species 
differs from all the others in habit and areolation, the upper cells 
having a distinct S like curve, while the back of the leaf near the 
apex isrough. A barren and rare Moss is Didymodon recurvifolious, 
the drooping-leaved Didymodon, and found only on the Scotch 
mountains, Ditrichum glaucescens. 
D. flexicaule, the wavy-stemmed, is not infrequent on calcareous 
rocks on the Scotch mountains and in Derbyshire. Growing in 
glossy yellowish-green tufts with stems 1-3in. high or more. 
Leaves lanceolate-subulate, concave, denticulate at apex, nerve 
broad. Capsule erect, ovate-oblong, small, with an amulus ; 
teeth 32, long and unequal. Z7ichostomum mutabile, the variable 
Trichostomum, frequents moist or shady banks in calcareous soil, 
and is found fruiting in June and July. Leaves lanceolate or 
ligulate ; spreading, crisped when dry, margain plain ; nerve pro- 
jecting into a slight mucro ; capsule ovate ; lid rostrate, annulus 
none. 
Greatly resembling the last species in size, &c., is Z. crispulum, 
the curly-leaved Trichostomum, but with linear-lanceolate leaves, 
concave and almost hood-like at the apex; nerve slightly excur- 
rent ; capsule erect, regular, oval with an oblique beak ; annulus 
none. Found on limestone rocks near the sea. 
Two species not fruiting complete the list of the genus Z: flavo- 
virens, and ZT: littorale. 
Of the Tortulas or screw Mosses, Z: canescens has only been 
found near Hastings, Sussex. Z: fragilis on Ben Lawers, and in 
Ireland. Z: sguarrosa on the chalk in the south of England and 
Treland, and 7: atrovirens, in March, on dry banks, &c., near the sea. 
