12 MUSCI-ACROCARP1-GYMNOSTOMI. [Schistostega. 



p. 27. t. 6. — Gymnostomum imberbe, E. Bot. t. 2237. — Schisti- 

 dium imberbe, Bryol. Germ. v. 1. p. 99. t. 8.f. 4. 



Rocks and stones, frequent. — /3. Mountains in the South of Ireland. 

 Miss Hutchins. Fr. March. 



2. A. striatum, Wils. MSS. (c/reen Branched- Beardless- Moss) ; 

 leaves ovate concave very obscurely cellular striated the margins 

 below reflexed, above distinctly recurved shortly acuminated 

 more or less diaphanous at the point, those of the perichsetium 

 toothed or serrated at the extremity, seta as long as the globose 

 capsule, lid rostrate. — x. subincanum; leaves decidedly striated 

 tipped with diaphanous points. — (3. unicolor; all the leaves 

 coloured at the points scarcely striated. 



Rocks near Llyn Idwel, Caernarvonshire. Apr. 1829. and /3., Glen- 

 gariff, Ireland. Mr. W. Wilson. Fr. Nov. — Mr. Wilson considers the dif- 

 ference in the leaves of this plant, as sufficient alone to keep it distinct 

 from the preceding. These differences (except what concerns the striae) 

 he finds to be constant, though certainly minute. 



7. Schistostega. Mohr. Schistostega. 



Seta terminal. Mouth of the capsule naked. Lid very thick, 

 with radiating cells (especially when seen from beneath). 

 Calyptra campanulate, at length often cleft. — Leaves bifarious. 

 {~Musc Brit. t. 1.) — Name, c-^ia-roq, cleft, and crsyu, the lid, from 

 an idea that the lid eventually became cleft or split. 



1. S. pennata, Hook, et Taylor, (jpennated Schistostega). 

 Muse. Brit. ed. 1. — ed. 2. p. 30. t. 8. — S. osmundacea, Mohr. 

 ' — Gymiwstomumpennatum, Hedw. St. Cr. v. \.t. 29. — G. osmun- 

 daceum, Fl. Brit. p. 1161. E. Bot. t. 2213. — Mnium osmun- 

 daceum, Dichs. Cr. Ease. 1. t. \.f. 4. 



Moist banks in several parts of Devonshire : especially in the south 

 of that county, Rev. J. S. Tozer. First discovered by Mr. Newberry 

 in the road from Zele to S. Taunton church, near Oakhampton. At 

 Tildersley and Worsley, Lancashire, Mr. W. Evans (formerly President 

 of the Tildersley Bot. Society, and a correspondent of the late Dr. 

 Withering); whence also specimens have been communicated to Mr. W. 

 Wilson by Mr. John Martin, a zealous and accurate Botanist of Til- 

 dersley. Roofs of the sandstone caverns, just beyond the Jews' bury- 

 ing-ground on the west side of the Gallow's Hill in Nottingham forest. 

 Mr. T. Jowitt. Entrance of a subterranean Gallery in Rowter rock 

 nearWinster, Derbyshire. J. E. Bowman, Esq. Fr. Spring. — This curious 

 and delicate little moss has a good deal the habit of the Fissidens 

 groupe of the Dicrana. Stems reddish, scarcely half an inch long, ex- 

 tremely slender. Leaves pinnated, decurrent, lanceolate, entire, with 

 very lax reticulations. Capsule exceedingly small, sphaerical, pale brown. 

 Since the publication of the remarks on the lid of this plant, in the 2d 

 edition of Muscologia Britannica, Mr. Bowman, and Mr. W. Wilson 

 examined living specimens together, but were quite unable to find any 

 trace of radiating fissures in the lid (as described by Hedwig), either 

 before or after it had been dried. The latter gentleman has subse- 

 quently remarked to me ; " the operculum is the very thickest and 

 the most sturdy that I ever met with in any Moss, filling up the mouth 

 exactly like a bung, composed strictly of cells of an hexagonal form per- 

 vading the thickness of the lid, and not unfrequently disposed so as to 



