LIST OF THE PLAXTS COLLECTED 67 



Parmelia conspersa (Ehrh.) Ach. 



Very common on exposed surfaces of large talus blocks about 



Table Xut, Hlarding Co., and elsewhere. 

 Parmelia sa.ratilis (L.) Fr. 



Frequent on talus blocks, with the preceding. 

 Peltigcra aphthosa (L.) Hoffm. 



Rare in the badlands ( Washington Co.) 

 Peltigera canina (L.) Hoffm. 



Rare in the badlands (\Yashington GJ.) 

 Ramalina pollinaria (Ach.) Tuck. 



Fairly abundant on talus blocks, Cave Hills. 

 Usnea barbata hirta Fr. Beard Lichen. 



Occasional on trees, especially dead limbs, in canyons at 



high elevations on the buttes of Harding County ; rare on 



Sheep Mt. in the Badlands. Locally abundant in the Black 



Hills. 



MOSSES 



Amblystegiiim compaction (C. M.) Aust. 



Abundant on moist rocks of canyons, Cave Hills and Bad- 

 lands. 

 Amblystegiiim riparium (L.) Bry Eur. 



Forming bogs in sluggish portion of brooks in Cave Hills 



and near Little Missouri River. 

 Brachythecinum salebrosum (Hoffm.) Bry. Eur. 



Common on shady banks of narrow gullies in the Forest 



Reserves, etc. 

 Bry urn arctlcum (R. Br.) Bry. Eur. 



Common on steppe slopes, but growing in more exposed 



situations than the preceding. 

 Bry um cernmim (Sw.) Lindb. (B. uliginosum.) 



With the preceding. 

 Bninin affine Bland? 

 Minium cuspidatnm (L. in part Schreb.) Leyss. 



Common in moist ravines, Cave Hills. 

 Orthotrichum rupestra Schleich. 



Rare, growing on talus blocks especially in spots where 



water collects. 



