62 MUSCI-ACROCARPI-PERISTOMT. \Bryum. 



at which period, especially when dry, the capsules are far more pyriform 

 than when younger. 



18. B. elongdtum, Dicks, (long-necked Thread-Moss); stems 

 short, leaves erect elongato-lanceolate acuminate serrated, nerve 

 reaching to the point, capsule elongato-clavate inclined (rarely 

 drooping), Dicks. Cr. Fasc. 2. p. 8. Turn. Muse. Hib. p. 1 14. 

 Fl. Brit. p. 1349. E. Bot. t. 1003. Hobs. Br. Mosses, v. 1. 

 n. 102. Drum. Muse. Scot. v. 1. n. 100. Muse. Brit. ed. 2. 

 p. 204. t. 30. — Pohlia elongate, Hedw. St. Cr. v. 1. t. 36. — 

 Pohlia minor, Schwaegr. Suppl. v. 1. P. II. t. 64. — Weber'a 

 alpina, Funck. — Bryum longicollum, Sw. Muse. Suec. t. 6. 



/. 13.— B. cylindricum, Dicks. Cr. Fasc. 4. t. 11./ 4. Fl. Brit, 

 p. 1351. 



Mountains, especially in the clefts of rocks and in caves. Fr. July. — 

 Allied to B. crudum, and the foliage is equally rigid and glossy, but the 

 capsule is very different. The peristome is that of a Pohlia ; that is, the 

 inner peristome wants the intermediate cilia. 



19. B. alpinum, Linn, (red alpine Thread-Moss); stems 

 elongated rigid branched, leaves closely imbricated erect lance- 

 olate somewhat obtuse subserrulate at the apex the margins 

 revolute, nerve reaching to the points, capsule oblongo-ovate 

 pendulous. — Linn. Mant. v. 2. p. 309. Turn. Muse. Hib. 

 p. 125. Fl. Brit. p. 1358. E. Bot. t. 1263. Schwaegr. Suppl. 

 v. 1. P. II. t. 73. Hobs. Br. Mosses, v. 2. n. 79. Muse. Brit, 

 ed. 2. p. 205. t. 28 Dill Muse. t. 50. /. 64. 



Low, moist, exposed rocks, in subalpine countries ; common. Fr. June. 

 — This species is readily known by its densely imbricated erect leaves, 

 of a deep shining purple colour. 



20. B. ventricosum, Dicks, (swelling Bog Thread-Moss); 

 stems elongated branched with innovations, leaves oblong 

 acuminated scarcely serrulate the margins recurved, nerve 

 reaching beyond the point, capsule oblongo-ovate pendulous. 

 Dicks. Cr. Fasc. 1. p. 4. Turn. Muse. Hib. p. 126. Fl. Brit, 

 p. 1365. E. Bot. t. 2270. Hobs. Br. Mosses, v. 1. n. 103. 

 Muse. Brit. ed. 2. p. 205. t. 30 — B. bimum, Schreb.— Turn. 

 Muse. Hib. p. 127. Fl. Brit. p. 1368. E. Bot. p. 1518.— B. 

 cubitale, Dicks. Cr. Fasc. 2. t. 5. Ft. Brit. p. 1364. E. Bot. 

 t. 2554. — Milium pseudo-triquetrum, Hedw. St. Cr. v. 3. t. 7. — 

 Dill. Muse. t.5l.f. 72. 



Marshy ground, in alpine and subalpine countries, and in the moist 

 crevices of rocks. Fr. July. — Stems 2 — 4 inches or more high, includ- 

 ing the innovations which are copious, often of a deep brown or reddish 

 colour, of which the foliage partakes to a degree. The leaves are gene- 

 rally erecto-patent, the nerve reddish, the margins revolute, the base more 

 or less decurrent. 



21. B. demissum, Hook, (club-fruited Thread-Moss); stems 

 very short branched, leaves ovate cuspidato- acuminate reticu- 

 lated, their nerve excurrent, seta arched, capsule curved and 

 pyriform, the mouth oblique. Muse. Exot. v. 2. t. 99. Grev. 



