36 MUSCI. [Beokeria. 



twice as long as the perichcetium ; capsule ovate. Muse. Brit, 

 ed. 1, p. 79, ed. 2, p. 137, t. 22. 



On stories and trees in the mountains. The fruit at Lough Bray. 



2. A. viticulosum, Hook, and Taylor. Leaves ovato-lan- 

 ceolate, obtuse, entire, their nerve percurrent ; setce elongated ; 

 cylindraceous. Muse. Brit. ed. 1, p. 80, ed. 2, p. 138. t. 32. 



On calcareous rocks or trees in their vicinity ; not uncommon. 

 This is extremely unlike the preceding species in habit. 



32. Daltonia. Hook, and Taylor. 



Seta lateral. Peristome double; outer of 16 teeth ; inner of 16 

 cilia alternating with the teeth. Calyptra campanulate. 



1. D. heteromalla, Hook, and Taylor. Muse. Brit. ed. 1, 

 p. 81, ed. 2, p. 139, t. 22. 



On trees ; common in all parts of Ireland. 



B. Inner peristome of cilia united below by a membrane or by 

 transverse processes. 



33. Fontinalis. Linn. 



Seta lateral. Peristome double; -the outer of 16 teeth ; the 

 inner of 16 cilia reticulated by transverse processes into a 

 cone. 



1. F. antipyretica, Linnaeus. Leaves nerveless, broadly 

 ovate or ovato-lanceolate. Linn. sp. pi. 1571. Muse. Brit. ed. 2, 

 p. 140, t. 22. F. squamosa, Linn. sp. pi p. 1571. 



In rivulets, adhering to wood or stone, The leaves sometimes ap- 

 pear complicato-carinate ; on examination this is found to arise from 

 the adherence of the outer edges of adjoining leaves; The habit of this 

 genus is very much of the continental Gymnostomum aquaticum of 

 Hoffman. They are more nearly allied than I believe is generally 

 supposed. Upon carefully removing the lid of the Gymnostomum, I 

 find the mouth of the capsule coloured of a reddish-brown, crenate, 

 the crenulations corresponding to an outer peristome ; within this is 

 an evident inner peristome of sixteen filiform, reddish, erect cilia 

 lying upon the columella. 



34. Hookeria, Smith. 



Seta lateral. Peristome double; the outer of 16 teeth; the 

 inner of 16 cilia united below into a membrane. Calyptra 

 campanulate. 



1. H. lucens, Smith. Leaves bifarious broadly ovate, en- 

 tire, obtuse, shining, nerveless. Sm. m. Tr. Linn. soc. v. 9, p. 

 276. Muse. Brit. ed. 2, p. 149, t. 27. 



Wet banks in woods ; common. 



2. H. albicans, Leaves bifarious, ovate, acuminulate, margi- 

 nate, subserrulate, with two almost percurrent nerves. H. late- 

 virens Muse. Brit.ed. I, p. 89, ed. 2, 149^ t. 27. Leskea albicans, 

 Hediv. Sp. Muse. t. 54, / 13—16. 



