114 STATE HORTICULTURAL SOCIETY 



Leucobryum, Hampe. 



1439. L. vulgare, Hampe. 



Common on low, shaded grounds. 

 Ceratodon, Brid. 



1440. C. purpureas, Brid. 



Common everywhere in exposed places on dry ground. 



1441. C. purpureas a r is tat us, Aust. 

 Not common. 



POTTIES TRIBE. 



Ditrichum, Br. & Sch. 



1442. D. pallidum, Hampe. 



Not rare ; on the ground in dry places. 



1443. D. tortile, Muell. 



Common on exposed hillsides; often grows associated 

 with Barbula unguiculata. 

 Desmatodon, Brid. 



1444. D. arenaceus, Sulliv. & Lesq. 



Rare, collected only on shaded sandstone rocks. 

 Barbula, Hedw. 



1445. B. rigida, Schultz. 



Not common; found only on the dry loess hills of 

 western Iowa. 



1446. B. unguiculata, Hedw. 



Common everywhere; growing on the ground or on 

 limestone rocks in damp places. 



1447. B. fallax, Hedw. 



Rather rare; found along the roadside on dry clay 

 ground. 



GRIMMIE^ TRIBE. 



Grimmia, Ehrh. 



1448. G. apocarpa, Hedw. 



Common on limestone rocks in early spring. 



