52 



MOSSES WITH A HAND-LENS 



HEDWIGIA 



is named for Hedwig, one of the best bryologists of the eigh- 

 teenth century. 



H. ALBICANS (Web.) Lindb. {H. 

 ciliata Ehrh.) is our only species. It 

 is common on boulders, ledges, stone 

 walls, and dry exposed places. The 

 plants vary a great deal in size, but in 

 general have much longer stems and 

 branches than their relatives, besides 

 being much the most common of all 

 the family. 



The lower part of the plant is 

 brown or black, 

 the upper green, 

 with a tinge of 

 gray due to 

 the colorless 

 tips of the 

 leaves. The 

 perichstial 

 leaves are ciliate 

 along their up- 

 per margins as 

 shown in the 

 cut. There is 

 no costa in any 

 of the leaves, 

 and no peris- 

 tome, both of 

 which charac- 

 ters are rare in 

 this family. The 

 capsules are en- 

 tirely concealed KjsgMggSoffiffi^SgS*^^^^ 

 in the longer f|fg|f8oS||°og°oSS%asfe'S?i'"»"i 



more slender 



1 . • 1 FiGURR 22. 



perichsetial , , „ ^ . • ,,.. 



. ji .1^ ^^ ^^^ 4^- Apices of leaves of Hedivigia almcans. 



leaves, and the ^^^ ^p^^^ ^f perichxtial leaf. (From Bry. Eur.). 



