Mr. VALENTINE on the existence of Stomata in Mosses. 245 
young state. i. Pedicel of the columella ;—most mosses have 
the pedicel solid. 7. Loose tissue of the apophysis. kk. Stomata 
opening into the intercellular spaces of the apophysis, through 
which they communicate with the cavity between the sporular 
and thecal membranes. Z. Opercular membrane. m. Peristome. 
n. Metula—the opercular membrane of Greville and Arnott. 
Fig. 8. Longitudinal section of a stoma, from a dried specimen of the 
: same. a. The ring cut through. 
Fig. 9. Transverse section of the same. 
Fig. 10. Stomata of a dried specimen of Dissodon splachnoides. 
Fig. 11. Transverse section of a stoma of the same. 
Note.—Fig. 1 and 7 are magnified 35 times; all the others are magnified 
100 times. 
VOL. XVIII, 2K 
