30 HOW TO KNOW THE MOSSES 



long and the plants are too short. 15. Barhula is not 

 common and the leaves are crisped when dry. 26. 

 Leptohryum has leaves too long. 36. Wehera has stems 

 too short with longer leaves. 38. Georgia looks more 

 like our plant but in reading the descriptions we find 

 that it usually grows on decaying wood and less fre- 

 quently on the ground; and besides, scattered among 

 the plants are stems with larger leaves arranged in a 

 cup-like cluster at the tip. We find nothing of this kind 

 in our specimen, so this genus will be discarded, leaving 

 only 4. Ceratodon that agrees with our plant in every 

 way. 



The following is an example of how to use the Cap- 

 sule Key. We will use the same moss that we used for 

 the Leaf Key. We have already decided that the plant 

 belongs in Division A, under "Plants growing on the 

 ground.'^ The next divisions are, "I. Capsule erect,'' 

 and "n. Capsule not erect." Our capsule is not erect. 

 Under this head we find the various shapes of capsules 

 given. Turning to the "Illustrations of Terms" (Plate 

 IV) , we decide that our capsule is cylindrical. Under 

 *' Capsule cylindrical" we come to "Leaves long 

 and narrow" and "Leaves short and broad." In 

 using the Leaf Key we found that the leaves of 

 our plant were long and narrow, hair-like through- 

 out. Following this heading to the right we find 

 the genus numbers i, 2, 4, 6, 7, 8. Looking through 

 the illustrations and descriptions we find again that 



