8o 



MOSSES WITH A HAND-VENS 



FIGURE 29. a. a, Ulota cr'.spa X 4 and X i respectively, b, b', Cap- 

 sules of the same X 20. c, Young sporophyte with calyptra X 20. d. d', U. 

 Ludwigii X 4 and X i respectively, e, Capsule X 20. f, Calyptra of 

 mature capsule X 21. 



twisted when dry. These two species grow exclusively on trees. 

 U. AMERICANA (Beauv.) Lindb., the American Ulota, grows 

 exclusively on rocks. Its leaves are rigid when dry like those 

 of Orthotrichum, not crisped as in the two tree-growing species ; 

 the capsules very closely resemble those of the Crisped Ulota. 



