Mosses and Lichens 



vein narrow; margin from the middle upward a pellucid mem- 

 brane bearing tiny protuberances, and bordered with hair-like 

 teeth, wavy when dry; cells, those of the 

 margin very small, dot-like; those of the 

 leaf-blade narrow. 



Habit of flowering. Male and female 

 flowers on separate plants (dioicous). 



Veil. Resembling a bishop's mitre, 

 long-beaked, rough at the apex only. 



Spore-cases. Oblong, egg-shaped, pale- 

 brown, finally darker. 



Pedicel. Short, | to | of an inch long 

 on a lateral branchlet. 



Lid (operculum}. Tapering from a con- 

 ical base. 



Teeth (peristome). Long, cleft into two 

 forks; orange-red. 



Annulus. Broad. 



Spores. Mature in summer. 



Distribution. Universal. 



Vertical section of peristome 



showing two cells of the an- 



nulusatthebaseof one tooth 



R. lanuginosum. 



HEDWIG'S MOSS 



Genus HEDWIGIA, Ehrh. 



The species of the Genus Hedwigia have two-forked stems 



with roots at the base. They are usually 

 found in hoary fragile patches 

 on rocks. 



The leaves are broad, oval, 

 veinless, and coarsely toothed 

 or fringed on the margins. 



The spore-cases are globu- 

 lar, immersed with almost no 

 pedicel and no peristome. 



There are ten species in 

 all, three in North America. 



The generic name was 

 given in honour of J. G. Hed- 



Plant stripped of wig, a distinguished German 



leaves to show two male flower- . . . 



clusters on the stem and one botanist, Who lived in 1782. 

 spore-case surrounded with 

 three fringed leaves. 



182 



H. ciliata. 

 Leaf. 



