12 MUSCI. [Tetrap/iis. 



1. A. ciliatum, Hedw. Leaves spathulato-ovate, acuminate, 

 concave, the margins recurved, their points diaphanous or 

 opaque, subserrated ; capsule immersed in the perichsetium ; 

 lid acuminulate. Hedw. Sp. Muse. p. 40. Muse. Brit. ed. 2, 

 p. 27, t. 6. A. striatum, Hook. Eng. Fl. vol. 5, part 1, p. 12 ? 



On mountain rocks, near Dunkerron, County Kerry. Mr. W. Wil- 

 son, whose authority is so justly great in muscology, is satisfied of the 

 distinctions between the A. ciliatum and A. striatum of the English 

 Flora. I have never seen the capsule entirely sessile ; the seta appear- 

 ed to me to vary in length, as also the length of the beak of the lid, 

 and opacity of the leaves. I find apparently both states, and even 

 intermediate ones, in our mountains, but I have never seen Mr. Wil- 

 son's specimens : the plate in Bryologia Germ, is very instructive. 



8. Diphyscium. Mohr. 



Seta terminal ; capsule gibbous ; peristome single, forming a 

 membranous plicate irregularly truncated cone. Calyptra 

 campanulate. 



I. D.foliosum Mohr. Ohs. Bot. p. 34. Muse. Brit. ed. 2, p. 

 31, t. 1. 



On moist banks in the mountains near Dunkerron, county Kerry. 

 Stems tufted : leaves green, compact, from a broad base, ligulate ; their 

 nerve broad, often colourless at the base, semitransparent and reddish 

 throughout, percurrent. The leaves are papillose, their apices incurved 

 by drying. Columella a sac about half the size and nearly of the 

 shape of the capsule, hence larger in proportion than in any other 

 genus ; it consists of a thin membrane, darker than the capsule. The 

 perichaetial leaves have a rigid strong nerve, on each side of which, at 

 the top, the pagina of the leaf is as it were torn down into shreds, 

 but the fissures or deep laciniations are by no means accidental. 



9. Tetraphis. Hedw. 



Seta terminal. Peristome single, of 4 equi-distant, erect teeth. 

 Calyptra campanulate, furrowed. 



1. T. pellucida, Hedw. Stems elongated ; leaves ovate, 

 acuminate, the perichaBtial lanceolate ; capsule cylindrical. 

 Hedw. Sp. Muse. t. 7, /. 1. Muse. Brit. ed. 2, p. 33, t. 8. 



On dry banks at Lough Bray, near Dublin ; by no means common 

 in Ireland. 



2. T. Broivniana, Grev. Stems short; leaves few, linear; 

 the perichaetial ovate obtuse ; capsule ovate. Greville Fl. Edi- 

 nensis, p. 230. Muse. Brit. ed. 2, p. 33. t. 8. 



On dry shaded rocks at Lough Bray, near Dublin. 



10. Splachnum. Linn. 



Seta terminal. Peristome single, of 8 double or 16 teeth, ap- 

 proached in pairs, (generally renexed when dry.) Capsule 

 with an apophysis ; calyptra campanulate, often split on one 

 side, smooth. 



