Weissia ] 



MUSCI. 15 



At Powerscourt Waterfall. 1812. The fruit I found at Campsie, 

 near Glasgow, in Nov. 1822. Barren plants not uncommon on wet 

 rocks in Ireland. Stems loosely tufted. Leaves loose, flexuose, 

 spreading, entire ; the nerve seen by transmitted light is less opaque 

 than the pagina of the leaf. The tuft usually half an inch in height, 

 sometimes even two inches. Seta scarcely an inch long. Calyptra 

 dimidiate. In the plate of Muse. Brit, the teeth of the peristome 

 are represented too broad at the base, and, perhaps, they are not ex- 

 actly equi-distant, but somewhat approached in pairs, which makes the 

 analogy with a Didymodon, viz. D. tortuosum MSS. from Nepal, very 

 strong ; and were it not that the latter has decidedly the peristome of 

 Didymodon, I could not distinguish them. It reminds one of Tortuia 

 tortuosa, but this is far more closely tufted, and of a pale yellowish- 

 green, while our plant is much greener, marks, independent of generic 

 difference. 



7. W. curvirostra, Hook et Taylor. Leaves lineari-subulate, 

 their margins closely reflexed, patent, shining, their nerve 

 strong ; capsule ovato-cylindrical ; lid shortly rostrate. Muse. 

 Brit. ed. 1. p. 46, ed. 2. p. 84, t. 14. Bryum curvirostrum, 

 Dickson. 



On walls and banks, common. Teeth of the peristome connected 

 at the base. A reddish hue of the stems and leaves of the former 

 season, while the annual shoots remain green, is very characteristic of 

 this species. It is usually tufted. 



8. W. controversa, Hedw. Leaves lineari-subulate, crisped 

 when dry, their margins incurved ; capsule ovato-elliptical, lid 

 rostrate. Hedw. St. Cr. v. 3. t. 5. B. Muse. Brit. ed. 2. p. 84„ 

 t. 15. 



On dry banks, common. 



9. W. recurvata, Hook, et Taylor. Stems very short ; 

 leaves subulate; capsule broadly ovate; seta curved ; lid rostrate. 

 Muse. Brit. ed. 1. p. 47. ed. 2. p. 85. t. 15. Grimmia recurvata 

 Hedw. St. Cr. v.\.t. 33. 



On old red sandstone on Brandon Hill : very rare, 



10. W. pusilla, Hedw. Stems very short; leaves subulate, 

 erecto-patent, subflexuose ; capsule turbinate ; seta erect ; lid 

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

 t. 15. 



Near Belfast. Mr. Templeton. Very rare; 



11. W. verticillata, Schwaegr. Leaves broadly subulate, 

 slightly concave, erecto-patent, with a strong nerve, papillose ; 

 capsule ovate; lid shortly rostrate. Schaewgr. Supp. p. 7].t. 

 20. Muse. Brit. ed. 2. p. 86. t. 15. 



On the perpendicular faces of dripping rocks. Dargle river. Of a 

 light pea-green colour. The lower portions of the stems and their 

 leaves are frequently loaded with incrustation, which, by chemical 

 tests, I find to be carbonate of lime, and this occurs where no lime- 

 stone is found in the district. 



