MNIACEAE 137 



sometimes even in water in the early spring. The stems 

 are often 3 inches or more in length, and the leaves 

 are larger than those of most mosses. 



Mnium punctatum var. datum Schimp. (Plate VI, 

 Fig. 5) is a common moss found in swamps and wet 

 woods, and may be known by the very large, broadly 

 egg-shaped leaves; bright to dark green; with a midrib 

 and thickened border easily seen when the plants are 

 held to the light. (Plate VI, Fig. 5a.) The stems are 

 stout, sometimes branched, and usually thickly covered 

 with reddish-brown radicles, called tomentum. The fruit 

 is not common. 



The species Mnium punctatum (L.) Hedw. is smaller 

 and not so frequently collected. It occurs on rocks as 

 well as on the ground. The leaves are the same shape 

 as those of the variety, only smaller. 



Range, Arctic America, Canada, and the northern United 

 States; Europe; Asia. 



Mnium cinclidioides (Blytt) Hiiben. (Plate VI, 

 Fig. 3) is sometimes found in the same swamp with the 

 preceding species, but is not so common and the fruit 

 is very rare. The leaves are bright green, oblong, rounded 

 at the end, and the midrib can be seen; but they are not 

 bordered as in Mnium punctatum, and the stems are not 

 covered with radicles. 



Range, northern North America, south in the East to 

 Pennsylvania; Europe; Asia. 



