420 EXPLANATION OF THE PLATES. 



Pterogonium. — Plant, capsule with calyptra. and two teetli of the 



peristome with three segments, of P. yracile, Swartz. 

 Hypnum {Uhynchosteyium). — Plant and capsule, with operculum, of 



11. Ueinlfisuin, Wils. 

 Hypnum {Tliulditun). —T\a.nt, and branch-leaf enlarged, of H. tama- 



riscliiuin, Hedw. 

 Hypnum (Thamnium). — Plant of II. alopecurum, Linn. 

 Hypnum. (llylocomium). — Plant, and capsule with operculum, of H. 



squarrvsuiii, Linn. 

 Hypnum, proper. — Portion of a stem of H. callichroum, Brid. 



