76 MUSCI-PLEUROCARPI-PERISTOMr. [Hypnum. 



2. Capsules cemnous or inclined. 



*3. H. ripdrium, Linn, (short-beaked water Feather- Moss); 

 leaves ovato-lanceolate acuminated entire the nerve reaching 

 almost to the summit, capsules oblong cernuous, lid conical. 

 Linn. Sp. PI. p. 1595. Hedw. St. Cr. v. 4. t. 3. Turn. Muse. 

 Hib. p. 152. Fl. Brit. p. 1292. E. Bot. t. 2060. HobsrBr. 

 Mosses, v. 1. n. 66. Schwaegr. Suppl. v. 1. P. II. p. 194. Muse. 

 Brit. ed. 2. p. 153. t. 24 — Dill. Muse. i. 40. f. 44. B, C, D. 



Banks of rivers, often partially in the water, and in spots occa- 

 sionally overflowed. Fr. Apr. — Stems 4 — 5 inches long. Colour lurid 

 yellow-green. This, like all plants liable to be acted upon by much 

 moisture, is variable in size, in its mode of growth and in the longer or 

 shorter stems and leaves. Mr. Wilson even doubts if it may not pass 

 into H. Jluitans ; but this opinion 1 have had no means of verifying. 



4. H. undiddtum, Linn, (waved Feather-Moss); leaves ovate 

 acute transversely waved with two faint nerves at the base, 

 capsule oblong furrowed arcuato-cernuous, lid rostrate. Linn. 

 Sp. PI. p. 1589. Turn. Muse. Hib. p. 154. Fl. Brit. p. 1294. 

 E. Bot. t. 1181. Hobs. Br. 3Iosses, v. I. n. 68. Brum. Muse. 

 Scot. v. 1. n. 75. Schwaegr. Suppl. v. 1. P. II. p. 197. Muse. 

 Brit. ed. 2. p. 153. t. 24.— Dill. Muse. t. 35. / 11. 



Woods, in dry heathy places and among rocks. Fr. Apr. — This plant 

 has peculiarly white, membranaceous, undulated leaves, and the cap- 

 side distinctly furrowed, which latter peculiarity gives it the same rela- 

 tion with the other Hypna as Br yum palustre and B. androgynun bear 

 to the rest of the Brya. 



5. H. denticuldtum, Linn, (sharp fern-like Feather-Moss); 

 leaves ovate sometimes approaching to lanceolate more or less 

 acuminate having 2 short nerves at the base, capsule oblongo- 

 cylindraceous inclined, lid conical. Muse. Brit. ed. 2. p. 153. 

 t. 24. — a. angustifolium ; leaves ovato-lanceolate distant quite 

 plane. Linn. Sp. PI. p. 1558. Hedw. St. Or. v. 4. t. 31. Turn. 

 Muse. Hib. p. 148. t. 12. /. 1. Fl. Brit. p. 1288. E. Bot. 

 t. 1260. Hobs. Br. Mosses, v. 1. n. 67. Drum. Muse. Scot. v. 1. 

 n. 74. Schwaegr. Suppl. v. 1. P. II. p. 187. Muse. Brit, 

 ed. 2. p. 153. t. 24. — H. sylvaticum, Schwaegr. Suppl. v. 1. 

 P. II. p. 182. t. 82.— Dill. Muse, t 34. /. 5.-/3. obtusifolium; 

 leaves ovate more or less obtuse slightly concave. H. denticu- 

 latum, (3. obtusifolium, Turn. Muse. Hib. p. 146. t. 12. /. 2. — 

 H. obtusatum, Wahl. Lapp. — H. Donianum, E. Bot. t. 1446. 



Woods and moist rocky places. /3. Mountains. Fr. May. — The above 

 varieties, as I have considered them, some botanists have ranked as 

 species: but if examined in their places of growth intermediate states 

 will be found. The texture of the leaf even is variable, more reticu- 

 lated in A. than in a. 



