THE POLYTRICHACE.E OF WESTERN NORTH AMERICA 



2. Polytrichum attenuatum Menz., in Trans. Linn. Soc. (1798), 



p. 72. 



Polytrichum conorhynchum Kindb., in Mac. Cat., p. 164 (1892). 

 Polylrichum formosum Hedw., in Sp. M., p. 92 (1801). 



Name derived from attenuatus = drawn out; referring to the 

 long narrow, simple form of the plant often found. 



Plants loosely tufted, dark green, 7-20 cm. high. Stems erect or 

 ascending, tomentose at base, simple or forked. 



Fig. 19. Polytrichum attenuatum. 



1 = Moist plant with capsule, XL 2 = Dry plant, X i". 3 = Capsule, X 5. 

 4 = Peristome, X 150. 5 = Leaf showing lamellae on upper side, X 15. 6 = Leaf 

 tip, X 65. 7 = Cross section of leaf showing lamellce ,X 65. 8 and 9 = Cross sections 

 of a few lamellae showing height and the marginal cells, X 250. 



