ACROGENS. (273 
and grows generally among heaths, in fir woods and bogs. Its 
principal stem creeps along the ground, throwing out from time to 
time adventitious roots, which penetrate the soil, throwing out 
branches to the surface. These branches carry the leaves, are 
narrow, lanceolate, or awl-shaped, and finely dentate or serrated 
on their edge; imbricate in a spiral form round the stem; the 
leaves of the lower part assume a reddish colour at maturity. 
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Fig. 396.—Polytrichum. 
he 336 the stems terminate, as we see in Nos. 1 and 2, by 
§ reddish filament carrying a pointed or cone-shaped cap 
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