458 Froceedlngs of the Royal Irish Academy. 
Hab. Damp "banks and rocky places in hilly parts of the coun- 
try, and by the sides of streamlets among the mountains, 
frequent. 
75. PoLYTETCHUM. Bridel. 
Calyptra as in Pogonatum. Capsule 4, 5, or 6-angled, with a dis- 
coid apophysis. Peristome single, of 64 — rarely of 32 teeth. 
Otherwise similar to Pogonatum in habit of growth, but the 
plant is much larger. 
Diagnosis of Species, 
a. Capsule with four angles. 
Stems elongated ; leaves patent, linear-subu- 
late, recurved, serrated at margin and 
on the back ; capsule with apophysis. 
Stems simple or branched ; leaves lanceolate- 
subulate, acuminate, subserrate, their 
margins involute ; capsule with apo- 
physis, 
Stems loosely csespitose ; leaves lanceolate- 
subulate, terminating in a diaphanous 
hair-like point, their margins involute, 3. P. pilifeeijm. 
aa. Capsule with six angles. 
Stems tufted ; leaves broadly subulate or 
linear-lanceolate, shortly cuspidate at 
apex, serrate ; capsule ovate or round, 
obscurely apophysate. 
Stems elongated ; leaves linear-lanceolate, 
sharply serrated, sheathing at base ; cap- 
sule 5 to 6-angled, pale brown ; lid 
conic-rostrate, . , . . . 
1. P. COMMUNE. 
2. P. JUNIPERINUM. 
4. P. GEACILE. 
5. P. ATTENUATUM. 
1. P. commune (Linn.). Sp. PI. 1, p. 1 100. Turner, Muse. Hib., 
p. 80. Engl. Bot., tab. 1197. Bryol. Brit., p. 211, tab. 10. 
Hab. Marshy woods, moors, &c. The largest of all our mosses, 
and one of the most abundant, varying much in habit and 
appearance, according to the places where it grows. 
2. P. junipernnum (Willd.). PI. Berol. Prodr., p. 305. Bryol. 
Brit., p. 213, tab. 10, fig. f. Bryol. Eiu^op., vol. iv. 
Monogr., p. 12, tab. 423. Schimp., Synops. Muscor., p. 447. 
Muscol. Brit,, Ed. 2, p. 45, tab. 10. Kabenhor., Bryothec. 
Europ., IS'o. 810. 
