206 HOW TO KNOW THE MOSSES 



Helodium lanatum (Stroem) Broth. {Thuidium 

 Blandowii (Web. & Mohr) Bryol. Eur.) has a northern 

 range, — Greenland, Labrador, and the northern 



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Helodium lanatum 



Helodium paludosum 



United States. The plants grow close together; the 

 stems are erect and stiff; the branches are closely and 

 regularly pinnate; the leaves are usually too small to be 

 seen easily; and the color is generally light green. 



Helodium paludosum (Sull.) Aust. {Thuidium palu- 

 dosum (Sull.) Rau. & Herv.) is the more frequent spe- 

 cies occurring in the Northern and Middle States. The 

 plants form loose spreading mats; the stems are pros- 

 trate, irregularly and distantly pinnate; the leaves are 



