CLASS XXII. ORDER H. 125 



peristome consists of a delicate membrane at the 

 base, and upwards becoming uniform acuminate 

 teeth : peduncle axillary. (Greatly resembles Hyp- 

 num, but the ciliae between the inner teeth of the 

 hynum will distinguish it, if a very high magnifier 

 be used.) — rostrata, (goose-neck moss) having a 

 long beak. (Muhlenberg found 16 species.) 



Bar TRAMiA. Inner peristome consists of a de- 

 licate membrane terminating in 16 acuminately 

 divided teeth disposed in pairs : peduncles termi- 

 nal, except halleriana. 56. 4 — arcuata^ (bow-moss) 

 branched, leaves serrate striate. (Muhlenberg 

 found 5 species.) 



Mnium. Inner peristome consists of a mem- 

 brane terminating in pointed teeth which are much 

 perforated with large holes compared with the size 

 of the teeth, having between them fine hairs : pe- 

 duncles terminal. 56. 4 — cusfiidatum^ (pricked- 

 tooth moss) holes through the teeth smallish. 

 (Muhlenberg found 1 1 species.) 



Bryum. Inner peristome consists of a mem- 

 brane terminating in pointed teeth not perforated, 

 having between them very fine delicate hairs : pe- 

 duncles terminal. 56. 4 — concideum^ (thread moss) 

 leaves entire spread, capsules erect pearform — 

 nutans-, leaves serrate at top, capsule pendant. 

 (About 12 species have been found in North Amer- 

 ica) 



Hypnum. Inner peristome consists of a mem- 

 brane terminating in pointed teeth not perforated, 

 having between them very fine hairs, to be seen 

 with a good magnifier : peduncles axillary. 56. 4 

 —-serpens^ (sleeping moss) creeping, leaves 1-nerv- 

 ed at bottom, entire. (Muhlenberg examined 38 

 species in North America-) 



