PLANTS OF IOWA 115 



ORTHOTRICHE.SC TRIBE. 



Orthotrichum, Hedw. 



1449. 0. porteri, Aust. 



Not rare; on dry rocks in the spring, associated with 

 the preceding. 



1450. 0. brachytriclium, Schimp. 



Common on the bark of trees ; fruiting in early spring. 



1451. 0. braunii, Bruch. & Schimp. 

 Rare ; growing on trees. 



PHYSC0MITRIE.5] TRIBE. 



Pyramidula. 



1452. P. tetragona, Brid. 



A very rare species with a limited distribution in the 

 United States; collected only on ledges on qnartzite. 

 Physcomitrium, Brid. 



1453. P. acuminatum, Brnch. & Schimp. 



Not rare in southeastern Iowa ; growing on low ground, 

 exposed to the sunshine. 

 Funaria, Schreb. 



1454. F. hygrometrica, Sibth. 



Common throughout the state ; growing on the ground 

 in woods and open places. 



BARTRAMIE.E TRIBE. 



Bartramia, Hedw. 



1455. B. pomiformis, Hedw. 



Very common on shaded bluffs bordering streams. 



BRYE^ TRIBE. 



Leptobryum. 



1456. L. pyriformis, Schimp. 



Not rare ; a very delicate form growing on the ground 

 or damp rocks. 

 Br yum, Br. & Sch. 



1457. B. intermedium, Brid. 



Very common everywhere, growing on rocks or on the 

 ground. 



