16 MUSCI. [Grimmia. 



12. W. acuta, Hedw. Leaves subulato-setaceous, subsecund, 

 rigid, concave ; capsule turbinate, the sides unequal ; lid ros- 

 trate. Hediv. St. Cr. v. 3. t. 35. Muse. Brit. ed. 2. p. 87. t. 15. 



On wet rocks at Kelly's Glen, near Dublin. Bawtry' Miss Hutchins ; 

 near Belfast, Mr. Templeton. The dry plant, as Mr. Turner ob- 

 served, is of a shining lustre. 



13. Grimmia. Ehrh. 



Seta terminal. Peristome single, of 1 6 teeth entire or perforated, 



rarely cleft, equidistant. Calyptra campanulate. 



In the two first of the species following the calyptra is dimidiate, 

 exhibiting the imperfection of our artificial divisions. 



1. G. apocarpa, Hedw. Leaves ovato-lanceolate, recurvo- 

 patent, their margins reflexed ; capsule ovate, immersed in the 

 perichcetium ; lid shortly and obliquely rostrate. Hedw. St. cr. 

 v.l.t. 39. Muse. Brit. ed. 2. p. 65. t. 13. 



Common in different situations from the level of the sea to very 

 considerable elevations. Varies in the breadth, and colour of the 

 leaves, and elongation of the stem : sometimes the summits of the 

 leaves are colourless and diaphanous. The capsule varies in length. 

 The calyptra is small in proportion to the full grown capsule, and truly 

 dimidiate. At the Dargle is a variety, whose capsules are higher than 

 the perichsetia. 



2. G. maritima, Turner. Stems ceespitose ; leaves lanceolate, 

 acuminate, nearly erect, crisped when dry, their margins re- 

 curved ; capsule immersed in the perichcetium ; lid shortly and 

 obliquely rostrate. Turner Muse. Hib. p. 23. t. 5. /. 2. Muse. 

 Brit. ed.2.p. 66. t. 13. 



On maritime rocks, common. The characters above given are not 

 very decisive of the difference of this species from the preceding, with 

 which the accurate Wahlenberg would join it. The calyptra here, 

 too, is small in proportion to the size of the capsule, and quite 

 dimidiate. 



3. G. saxicola, Schwaegr. Stems very short ; leaves lineari- 

 subulate, crisped when dry, seta geniculate ; capsule ovate ; lid 

 rostrate, straight. Schwaegr. Supp. v. 1. p. 82. t. 22. Muse. 

 Brit. ed. 2. p. 67. t. 13. 



On granite rocks near Lough Bray, County of Wicklow : very rare. 

 Calyptra multifid at the base, closely investing the capsule. It is an 

 extremely minute plant, and may easily be confounded with Weissa 

 trichodes, which is found in similar situations. 



4. G. pulvinata, Smith. Stems short, tufted ; leaves ellip- 

 tical, narrow, their margins recurved, their diaphanous points 

 subserrulate ; seta curved ; capsule ovate, striated ; lid conical 

 acute. Eng. Bot. t. 172S. Muse. Brit. ed. 2.p. 68. t. 13. Bryum 

 pulvinalum Linn. Sp. PL p. 1586. 



On rocks in the mountains, common. Although the teeth of the pe- 

 ristome are sometimes cleft, and often perforated, yet the general habit 



