176 NEW YORK STATE MUSEUM 



It is a large and easily recognized species. Its stems are composed of 

 a series of curved or arched segments. A new arch is formed each year, 

 beginning its growth a little below the tip of the preceding year's 

 formation and curving in the same direction with it. Stems many 

 inches long are sometimes found and if they did not decay at the base 

 as growth progresses at the upper part it would be possible to tell the 

 age of the moss by counting the segments of the stem. They some- 

 times attain such a length tliat, when growing on l)oulders, they stretch 

 across and hide the crevices betw^een them and make it dangerous for 

 any one to attempt to walk over such hidden pitfalls. 



Hypnum umbratum EJirh. 



Ground and mossy rocks in woods. Common. More slender thanf 

 the preceding which it somewhat resembles. 



HYLOCOMIUM. 



Hypnum triquetrum L. 



Ground and base of trees. Common. A large coarse upright moss, 

 rarely fruiting in North Elba. 



JUNGERMANNIACEAE 



Frullania Eboracensis Lehm. 



Trees. A very common species occurring chiefly on trunks of deciduous 

 trees. Its color is usually dark green or blackish. 



Frullania Asagrayana Mont. 



Trees and rocks. Common. It usually grows on trunks and branches 

 of spruce and balsam fir. Its color is generally reddish brown. It is 

 easily recognized under the microscope by the row of peculiar cells ex- 

 tending through the middle of the leaf 



Radula complanata (Z.) Dunwrt. 

 Base and roots of trees. Wood farm and Indian pass trail. 



Porella platyphylla (Z,.) Lindb. 



'I'runks of trees anil rocks. Common. Often associated with Neckera 

 pennata Hedw. 



