POLYTRicHACEiE.] 49 [Polytfichuni. 



Pol. dubium Scop. F1. earn. 2 ed. ii, 310 (1772). 



Pol. axillare Lam. F1. franc, i, 43 (1778). 



Pol. pulveridentum Reyn. in Act. Lausan. ii, P. i, p. 11 (1780). ROhl. op. cit. 216. 

 Brid. Muse, rec., Sp. muse, et Mant. Schwaegr. op. c. 322. 



Pol. fasciculatum Michx. F1. bor.-amer. ii, 294 (1803). Brid. Sp. muse. 64. 



Pogonaium pulverulentum P. Beauv. Prodr. 84 (1805). 



Pog. fasciculatum P. Beauv. op. cit. 84. 



Pog. urnigernm P. Beauv. op. cit. 85. Rohl. Deutsch. Fl. iii, 60 (1813) ; Ann. Wett. 

 ges. iii, 228 (1814). Brid. Bry. univ. ii, 124 (1827). Br. Schimp. Bry. eur. iv. Men. 8, 

 t. 9 (1844) ; Syn. muse. 440 (i860), et 2 ed. 537 (1876). Wils. Bry. Brit. 208, t. xi 

 (1855). Berk. Handb. Br. m. 211 (1863). Milde Bry. siles. 249 (i86g). De Not. 

 Epil. Briol. Ital. 338 (1809). HusN. Mouss. Nord-ouest 135 (1873). Hoek. Syn. 

 br. m. 102 (1873). 



Dioicous; pale glaucous green above, ferruginous brown below; in 

 wide lax patches. Stem erect i — 3 in. high, rigid, innovating laterally 

 and more or less fasciculate. Lower leaves minute, scale-like, cuspidate, 

 upper crowded, coriaceous, patent when moist, straight and incumbent 

 when dry, from a shortly sheathing base, broadly lineal-lanceolate, very 

 acute, nearly plane, margin serrate throughout with solid acute teeth, 

 also slightly serrate at back of apex ; lamellae dense, low, straight, about 

 48, each in section of one row of 4 — 5 cells, the marginal larger, round, 

 incrassate, papillose on the surface. Perichaetial bracts narrow, subulate, 

 with long sheathing bases. Seta longish, reddish yellow. Calyptra 

 yellow-brown, prolonged below capsule. Capsule nearly erect, ovate- 

 oblong, cylindraceous, somewhat contracted below the mouth, pachy- 

 dermous, rufous brown, papillose with ascending conical granules, 

 without stomata ; lid convex with a straight subulate beak. Peristome 

 from a broadish orange basal membrane, teeth 32, equal, rufous, rather 

 short. Spores smooth. Male plants shorter and more slender, bracts 

 very broad, obovate, with a short point. 



Hab. — On banks and by streams in subalpine districts, not uncommon. 

 Fr. 1.1 — I. 

 Var. /3. Humile Wahlenh. 



Stem short, simple; leaves shorter, straight. Capsule narrower, ovate, 

 subcernuous, on a shorter seta. 



Syn. — Pol. urnigerum var. /3. humile Wahlenb. Fl. lapp. 347 (1812). Brid. Mant. muse. 199 ; 

 Bry. univ. ii, 126. Schimp. Syn. muse. 440, et 2 ed. 537. 



Hab. — Dry stony places on moorlands. 



This species varies somewhat in size and colour, and the capsules 

 occasionally are a little asymmetric ; the papillae extend over the lower part 

 of the lid. 



4. POLYTRICHUM ALPINUM L. 



Dioicous ; stem tall, fasciculate-branched . Leaves longly sheathing, 

 lineal-lanceolate, sharply serrate, spinulose at back. Capsule sub- 



