20 



MOSSES WITH A HAND LENS 



Fig. 15. a, a, Weissia ulophylla X 4 and X 1 respectively, b, b\ Cap- 

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

 Weissia coarctata X 4 and X 1 respectively, e, Capsule X 20. f, Calyptra 

 of mature capsule X 21. 



narrow and much twisted when dry. These two species grow 

 exclusively on trees ; the third, the American Weissia, grows exclu- 

 sively on rocks. Its leaves are rigid when dry like those of Orthot- 

 richum, not crisped as in the two tree-growing species; the cap- 

 sules very closely resemble those of the Crisped Weissia. 



All three of the Weissias are common in the hilly regions of 

 our range. They mature their capsules in autumn or early win- 



