148 D1PLOPERISTOMI. ^Bartramia. 



i HAB. Moist mountain rocks. 



The foliage of this has great affinity with that of B. pomi- 

 formis /3., and the stems vary from two to five and six inches. 

 These, however, are exceedingly proliferous, throwing off their 

 shoots from the summits, whence the fruit of the two or three 

 preceding years, still remaining on the stems, has the appearance 

 of being lateral. The fruitstalks are very short and curved. Cap- 

 sules globose, much furrowed. The stems, as in most of the species, 

 are covered with thick, fuscous, downy roots. Mr. Arnott is 

 disposed to consider this moss as a state of B. pomiformis @. 

 6. JB. arcuata ; stems much elongated proliferous, leaves horizon- 

 tally patent ovato-lanceolate acuminated serrated striated, 

 fruitstalks very short arcuate at length lateral, capsule 

 smooth. (TAB. XXIII.) 



Bartramia arcuata. Brid. Muse. v. 4. p. 139. Turn. Muse. Hib. p. 

 109. Smith, FL Brit. p. 1343. Engl. Bot. t. 1237. Schwaegr. 

 Suppl. t. 62. Hook. FL Scot. P. II. p. 140. Hobson, Brit. Mosses, 

 v. 1. n. 62. Drummond, Muse. Scot. v. 1. n. 69. Schwaegr. Suppl. 

 v. 1. P. II. p. 61. t. 62. Arn. Disp. Muse. p. 41. Brid. Meth. p. 116. 

 Mnium arcuatum. Dicks. PI Crypt. Fasc. 3. p. 2. t. 7. / 3. 

 Hypnum chrysocomum. Dicks. PI. Crypt. Fasc. 2. p. 12. 



HAB. Mountains of England, Scotland, Wales, and Ire- 

 land. In the greatest profusion upon wet rocks at 

 Lowdore Waterfall and Keswick. In fructification 

 abundantly at Lidford Fall, Devon. Dr. Greville. 

 This extremely beautiful moss, unknown on the Continent, 

 is rare in most parts of England ; yet in the mountainous dis- 

 tricts of Ireland is of very common occurrence. It is readily 

 enough known from all the rest of the genus by its perfectly 

 globose, large, and smooth capsules, by the greater flexibility 

 of the stems and rigidity of its leaves, which never become 

 twisted or curled by drying. These leaves resemble most those 

 of B. gracilis, but they are broader at the base, striated, and of 

 a bright shining yellow green colour. Schwaegrichen gives the 

 Isle of France, St. Domingo, and Jamaica, as stations for this 

 species, the latter on the authority of Swartz's Mnium tomen- 

 tosum, which, however, we have ascertained to be a different 

 species, having long fruitstalks and capsules, the former upright, 



the latter deeply furrowed. 



18 



