Vi MOSSES WITH A HAND-LENS 



KEY NO. 1 



Based Mainly on Structural Characters. 



Gray to gray-green ; growing only in bogs and swamps, 



Peat Mosses. 



Not gray (except White Moss) ; growing in various situations, 2. 



2. Acrocarpous, A. 



Pleurocarpous B. 



1. Capsules square in cross- section; calyptra hairy, 



Polytrichum. 



Capsules rounded in cross-section ; calyptra various, . 2. 



2. Blackish, or brownish-green ; growing on bark of living 



trees, 3. 



Green (except Hedwigia) ; not growing on trees, . . 4. 



3. Capsule long exserted, not wrinkled when dry, 



Drummondia. 



Capsule barely exserted ; strongly wrinkled, or puckered 

 about the mouth when dry, .... Weissia. 



4. Capsules sessile ; seta lacking, 5. 



Capsules exserted ; seta evident, 6. 



5. Capsules green, nearly spherical ; plants of sandy fields, 



Pleuridium. 



Capsules ventricose ; plants growing on shaded banks, 



Webera. 



Capsules subspherical, somewhat urn-shaped when dry 



and empty; plants blackish-green, growing on rocks, 



Hedwigia. 



6. Capsules erect, urn-shaped, . . . Physcomitrium, 

 Capsules erect, greatly swollen at base, . . Splachnum, 

 Capsules strongly ventricose; mature plant without 



leaves, Buxbaumia. 



Capsules erect, cylindric, nearly or quite straight, . 7. 

 Capsules arcuate, unsymmetric, usually cernuous, . 10, 

 Capsules symmetric, cernuous or pendent ; ovoid, pyri- 



form, or subglobose, . Mnium, Bryum, and Letobryum, 



7. Plants growing on rotten wood, rarely on moist peaty 



soil Georgia, Dicranum flagellare. 



Plants not growing on rotten wood, 8. 



8. Plants with hairy calyptra and appearance of the Hair- 



cap Mosses, Pogonatum. 



Without hairy calyptra, 9. 



9. Growing in moist shady places, .... Catharinea. 

 Growing in dry exposed places, . . 



. Dicranum, Dicranella heteromalla orthocarpa. 

 Growing on boulders, .... Dicranum fulvum. 



10. Greenish-white, Leucobryum. 



Dark to light green, not white, 11. 



