BY REV. W. WALTER WATTS AND THOMAS WHITELEGC4E. 



work on the British Mosses, with whioli Dr. Brotherus, in 

 * Bryales,' is in considerable agreement : — 



Order MUSCI. 



Suborder 1. SPHAGNALES. 



Suborder 2. ANDRE.EALES. 



Suborder 3. BRYALES. 

 Group A. NEMATODONTES (Polytrichaceffi). 

 Group B. ARTHRODONTES. 



Subgroup i. Acrocarpi. 



Subgroup ii. Pleurocarpi. 



Among the Acrocarpi we have followed, without distinct 

 headings, the Order Haplolepidei {Fissidentacece, Archidiacece, 

 Ditrichacece, Dicranacece, Leucohryacece, C alymperaceoi^ Pottiacecc, 

 Enca^yptacice, Grimmiacece), and Diplolepidei [Orthotrichacece, 

 Sjjlachnacece, Funariaceoi, Bartramiacece, Bi'yacece, JIniacece). 

 Among the Haplolepidei we have placed first, w4th Dr. C. Mueller, 

 the distichophyllous Fissidentacece. The terms, Haplolepidei and 

 Diplolepidei, scarcely apply to the non-peristomate members of 

 the included families, but they form a valuable practical guide to 

 the arrangement of the Acrocarps. The Pleurocarps are all 

 Diplolepidei. 



The Mosses of Lord Howe and Norfolk Islands are excluded 

 from this Census on zoogeographic srrounds. 



We have refrained from stating the fruiting season of the 

 different species, there being considerable variation north and 

 south, east and west. July to December may be regarded in 

 general as the best time for collecting; but allowance must be 

 made for altitude and latitude. The Fissidentes may be found 

 in full fruit as early as April and May, and there is no time of 

 the year when fruiting specimens of many of our mosses may not 

 be collected, especially in damp gullies and about the shady banks 

 of creeks. 



