174 DIPLOPEHISTOMI. [Hypnum. 



HAS. Moist shady banks, and on trunks of trees, especially 



on such as are in a state of decay. 



Mohr has justly observed how extremely variable is the mode 

 of growth of this plant, nor have we brought together so many 

 synonyms without a cautious examination of authentic specimens. 

 In mountainous marshy situations the variety named StoJtesii, 

 with closely set, bipinnate branches, occurs ; and in wet hollows 

 in banks is found the variety Swartzii, which is well represented 

 in the magnified figure of Turner's Muse. Hib. t. 14. f. 2. 6. 

 It, is characterized by its slender straggling branches, narrow 

 and black-green foliage. 



Stems pinnate, or irregularly branched. 



35. H. flagellare; stems pinnate (or irregularly bipinnate), 

 leaves thickly set cordato-acuminate serrated very faintly 



x two-nerved at the base, capsule oblong cernuous, lid conical. 

 (TAB. XXV.) 



Hypnum flagellare. Dicks. PI Crypt. Fasc. 2. p. 12. Smith, FL 

 Brit. p. 1322. (notofHedw.) Hook. Fl. Scot. P. II. p. 145. Hobson, 

 Brit. Mosses, v. 2. n. 65. Brid. Meth. p. 184. Am. Disp. Muse. p. 

 64. 



Hypnum umbratum. Engl. Bot. t. 2565. Turn. Muse. Hib. p. 158. 

 (not ofHedw.J 



HAB. Rocks in alpine countries. Plentiful in Ireland. 

 By means of authentic specimens from Mr. Dickson of his 

 H. flagellare, we have ascertained that it is the H. umbratum 

 of Turner and Smith, and not of Hedwig, which differs in its 

 ramification, its striated, much more strongly serrated leaves, 

 and its longer divided nerve, approaching very nearly to H. 

 triquetrum; especially that variety of it called brevirostre by 

 Ehrhart. Hedwig's H. flagellare is H. plumosum. 



36. H. abietinum ; stems pinnate, leaves serrated papillose on the 



back the margins reflexed the nerve running nearly to the 

 point the cauline ones cordato-acuminate those of the branches 

 cordato-acute, capsules cylindrical inclined, lid conical. (TAB. 

 XXV.) 



Hypnum abietinum. Linn. Sp. PI. p. 1591. Hedw. St. Cr. v. 4. 

 t. 32. Turn. Muse. Hib. p. 162. Smith, Fl. Brit. p. 1300. Engl. 



