WEISSIA.* 



By a. J. Grout. 



THE Weissias have the characteristic brownish-green or black- 

 ish-green color of the Grimmia family. They are distin- 

 guished from all save Orthotrichum by the hairy calyptra. 

 Both Orthotrichum and Weissia grow on the bark of trees or 

 more rarely on rocks, in cushions of varying size and thickness. 



Dlscriptign of Figures, a, a, Weissia ulophylla X 4 and X i re- 

 spectively, b, b', Capsules of the same X 20. c, Young sporophyte with 

 calyptra < 20 d, d', Weissia coarctata X 4 and X i respectively, e, Cap- 

 sule ;■; 20. f, Calyptra of mature capsule X 21. 



