Moore — On the Mossos of Ireland. 
427 
Ilab, Chiefly on trunks of trees, whose stems and branches are 
often quite covered with it ; also on walls and rocks. Very 
common. 
66'^. Pylaisia. Schimp. 
• Orthothecium. Bryol. Europ. 
Stems creeping. Capsule ovate, oblong- elliptic, upright or slightly 
inclined. Peristome double ; the outer of 16 linear-lanceo- 
late sharp-pointed teeth ; the inner cilia rising from a short basi- 
lar membrane, equalling in length the outer teeth, and in- 
terruptedly cleft along their keels, rudimentary irregular ciliolee 
sometimes present. Leaves ovate or lanceolate, mostly plicate, 
and for the most part without a distinct middle nerve ; areolation 
composed of long hyaline cells, larger towards the base. The 
species under this genus have been placed in different genera. 
Wilson includes them under Leskea in his " Bryologia Britannica." 
Diagnosis of Species. 
Leaves imbricated, lanceolate-acuminate, 
plicate- striate, nerveless, . . . 1. P. rufescens. 
Leaves lanceolate, erecto-patent, subsecund, 
nerveless, entire, slightly striate, . 2. P. subrufa. 
1. P. rufescens (Schwaegr.). SuppL, tab. 86. Pylaisia rufes- 
cens, Pabenhor., Bryothec. Earop., ^^o. 134. Orthothecium 
rufescens, Bryol. Europ., vol. nr. Monogr , p. 3, tab. 460. 
Leskea rufescens, Bryol. Brit., p. 534, tab. 25, Hypnum 
rufescens, Engl. Bot., tab. 2296. Hooker and Taylor. Mus- 
col. Brit., p. 164. 
Hab. Mountain rocks. Abundant on and about Benbulben, Sligo. 
2. F. subrufa (Wilson). Leskea subrufa, Bryol. Brit., p. 33, tab. 
54. Orthothecium intricatum, Bryol. Europ., vol. v. Monogr., 
p. 5, tab. 462-463. Isothecium chryseum, Sprace, Ann. JN^at. 
Hist., vol. iii., p. 147. 
Hab. Mountain rocks. Benbulben, Sligo, where I collected this 
rare moss in fruit, very sparingly in July, 1856, JN'ot 
observed elsewhere in Ireland, so far as I know. 
