358 
Proceedings of the Royal Irish Academy. 
Hab. Mr. David Orr finds on rocks at Howth and Killiney a plant 
which the late Mr. Wilson considered to be this species, but it 
occurs only in a barren state at both localities, and cannot, 
therefore, be identified with certainty. Musheragh Mountain 
Cork, Isaac Carroll. 
11. G. leucophcea (Greville). Scot. Crypt., Flor., tab. 284. Bryol. 
Brit., p. 161, tab. 30. Muscol. Brit., p. 70. Grimmia laevigata, 
Bridel., Bryol. Univ., 1, p. 773. 
Hab. On trap rocks, near the Giant's Causeway, Antrim ; also on a 
similar geological formation on the Island of Rathlin, 1837. 
19. ScHiSTiDiuM. Br. et Schimp. 
Capsule immersed in the perichsetal leaves, roundish and wide 
mouthed. Operculum depressed rostellate, deciduous with the 
columella ; annulus nearly wanting. Peristome single, of 1 6 lan- 
ceolate cribrose teeth, inserted below the mouth of the capsule, 
transversely barred without a medial line. Calyptra small, 
lacerated at the base. Inflorescence monoicous ; male flowers 
gemmiform. Scarcely differing from Grimmia. 
Diagnosis of Species. 
Plants tufted ; leaves hair pointed, blackish ; 
• teeth of peristome cribrose and lacerated ; 
annulus none, . . » . . 
Plants loosely coespitose, leaves spreading 
from an erect base, . . . 
Plants densely tufted, leaves crowded, rigid. 
Growing near the sea. 
1. S. CONFERTA. 
2. S. APOCAEPUM. 
3. S. MAEITIMT7M. 
1. S. confertum (Br. et Schimp.). Bryol. Europ., vol. nr. Monogr., p. 
7, tab. 232. Bryol. Brit., p. 149, tab. 44. De. Notr., Briol. Ital., 
p. 71 1. Grimmia conferta (Funck). Schimp., Synops. Muscor., p. 
199. G. apocarpa, var. conferta. C. Miiller, Syn. Muscor. 
Hab. On rotten trap rocks near Belfast. Only the variety B. 
incana, Grimmia pruinosa, Wils. M. S. has been collected, the 
typical form has not yet been observed in Ireland. 
2 S. apocarpum (Br. et Schimp.). Bryol. Europ., vol. m. 
Monogr., p, 7, tab. 233. Bryol. Brit., p. 150, tab. 13. De Notr., 
Briol. ItaL, p. 71 1. Grimmia apocarpa, Turner, Muscol. Hib. 
p. 20. Smith, Engl. Bot., tab. 1134. 
