POTTIACEAE 103 



Seta more than % inch long; orange-brown. 

 Capsule long-cylindrical, erect; orange-brown; mature in 

 June. 



Operculum long-beaked. 



Stems erect, more than >^ inch long. T. tortuosa. 

 Stems erect, less than ^ inch long. T. caespitosa. 



Tortella tortuosa Tortclla caespitosa 



Leaf and peristome enlarged. Leaf enlarged. 



Tortella tortuosa (L.) Limpr. \s found on rocks in 

 mountainous or hilly regions. 



Range, Greenland; Canada; northern United States; 

 Europe; Asia; Africa. 



The stems of this species are usually i or 2 inches 

 long, robust, yellowish-green above, brown below, and 

 covered with brown radicles. 



Tortella caespitosa (Schwaegr.) Limpr. (Barbula 

 caespitosa Schwaegr.) is a much smaller species than T, 

 tortuosa. It grows on earth and roots of trees in the woods. 



Range, Ontario and New England to the Gulf States, 

 west to British Columbia; Mexico; South America; Europe; 

 Asia; Africa. 



