3Ir. Valentine oti the evisfoice o/'Stoinata in Mosses. 245 



young state. /. Pedicel of tlie coluinelhi; — most mosses have 

 the pedicel solid. /. Loose tissue of the apopliysis. hh. Mtoinata 

 opening- into tlie intercellular spaces of the apopliysis, through 

 which they communicate with tlie cavity between the sporular 

 and thecal membranes. /. Opercular membrane, m. Peristome. 

 n. Metnla — the opercular membrane of Greville and Ariiott. 



Fig-. 8. Longitudinal section of a stoma, from a dried specimen of the 

 same. u. The ring cut through. 



Fig. 9. Transverse section of the same. 



Fig. 10. Stomata of a dried specimen of DIssodon sptacltnoides. 



Fig. 11. Transverse section of a stoma of the same. 



Note. — Fig. 1 and 7 ;ire magnified 35 times ; all the others are magnified 

 100 times. 



VOL. XVIII. 2 K 



