Weissia.] MUSCI-ACROCARPI-PERISTOMI. 23 



Turn. Muse. Hib. p. 27. — Bryum viridulum, Huds. — Bryum 

 virens, Dicks.— Dill. Muse. t. 48./. 43. 



Banks, frequent. Fr. Spring. — See Mr. Wilson's remarks on the 

 affinity of this plant with Gymnostomum microstomia)!, under that 

 species. 



15. W.calcdrea, Hedw. (Chalk Weissia); stems scarcely any, 

 leaves erect from a broad base linear obtuse thick with a very 

 broad nerve, capsule turbinate, lid rostrate. Hedw. Sp. Muse, 

 t. 11./ 1—6. Hobs. Br. Mosses, v. 2. n. 30. Muse. Brit. ed. 2. 

 p. 85. t. 15. — Grimmia calearea, Fl. Brit. p. 1177. Turn* Muse. 

 Hib. p. 25 Bryum calcareum, Dicks. — E. Bot. t. 191. 



On the perpendicular faces of chalk cliffs in the south of England, 

 which are rendered almost black with it. Fr. May. — The short, upright, 

 rigid leaves of this plant have a striking appearance, and resemble re- 

 markably, in miniature, those of Polytrichum a/oides, to which also their 

 dense texture assimilates them, their upper half consisting almost entirely 

 of the broad nerve, which below is much narrower, passing gradually 

 on each side into the dilated base. 



10. W. recurvdta, Hook, and Taylor, (recurved Weissia); stems 

 scarcely any, leaves erect subulate, capsule broadly ovate seta 

 curved, lid rostrate. 3Iusc. Brit. ed. I. p. 47. ed. 2. p. 85. t. 15. 

 Drum. Muse. Scot. v. 2. n. 36. — Grimmia recurvata, Hedw. St. 

 Cr. v. 1. t. 38. Fl. Brit. p. 1183. E. Bot. t. 1489. Turn. Muse. 

 Hib. p. 24. — Bryum curvatum, Dicks. 



Rocks in the north of England, Wales and Scotland. Fr. June. — 

 The fruitstalk of this plant, always arched when growing, or if moistened 

 after being gathered, sufficiently distinguishes it from the following 

 species. 



17. W. pusilla, Hedw. (dwarf Weissia); stems scarcely any, 

 leaves subulate erect, capsule pyriform, seta always erect, lid 

 rostrate. Hedw. St Cr. v. 2. t. 29. Muse. Brit ed. 2. p. 86. 

 t. \o. — Grimmia pusilla, Fl. Brit. p. 1184. E. Bot. t. 2551. 



On white limestone rocks, near Belfast, Mr. Templeton and Mr* 

 Drummond. Youlgreave, Derbyshire, ./. B. Bowman, Esq. Near Buxton, 

 Mr. W. Wilson. Fr. May. 



18. W. verHciUdta, Schwaegr. (whorled Weissia); sterna elon- 

 gated branched) leaves nearly erect Linear-subulate with a strong 

 nerve dotted, capsule ovate, lid conico-acuminate. Schwaegr. 

 SuppL r. I. p. 71. t 20. Muse. Brit. ed.2. p. 86. t. 15*— 

 Grimmia verttciilata, Turn. Muse. Hib. p. 31, 11. Brit p. 1191. 

 /.'. Bot t 1258. — Weissia capilfacea, Schwaegr. — Bryum fasd- 

 culu/iiiii, J)i<Ls — Bryum verticillatuin, I. inn. — J)ill. Muse t. 17. 



On rocks among trickling water, not general. Fr. Aug. — this pretty 

 Weissia, of a delicateh pair and bright green colour, has the lower cart 

 ot its stems frequent!} covered with a white earthy incrustation, which 

 is found on the plant, whatever be the nature of the rock whereon it 

 grow i, whether micaceous schist, as .it the Dargle, Ireland, or sandstone, 

 nth of Ireland, or on i al« an si in Yorkshin 



