PLANTS OF IOWA 45 



499. M. atrata, (Pers) Fckl. 



On dead herbaceous stems (Ambrosia trifida). 

 NIPTERA. 



500. N. saliceti, (Rehm.) Sacc. 



Plants minute, light colored. On wood which is much 



decayed. Not common. 

 ORBILIA. 



501. 0. chrysocoma, (Bull.) Sacc. 



On rotten wood. This species is very common in woods. 

 501a. 0. vinosa, (A. and S.) Karst. 



Plants small, similar to preceding, but red instead of 

 yellow. On rotten wood. Common. 



PATELLARIACE-ffi FAMILY. 



KARSHIA. 



502. K. lignyota (Fr.) Sacc. 



On decorticated wood. Not common. 

 DURELLA. 



503. D. clavispordj (B. and Br.) 

 HYSTEROPATELLA. 



504. H. prostii, (Duby) Behm. 

 On old bark (elm?) 



505. H. elliptica (Fr.) Rehm. 

 On old bark (crab apple?) 



PATELLARIA, Fries. 



506. P. melaxantha, Fries. 

 On wood. Rare. 



507. P. salvispora, (Peck) Sacc. 



Plants are small. Black. Common on willow. 



508. P. (Mycolecidea) triseptita, (Karst.) 

 Plants sessile. On old wood. 



LECANIDION. 



509. L. atratum, (Hedw.) Rabenh. 

 Rather common. 



