THE AMAZONS AND ITS TBIBUT ABIES. 127 



Chthonoblastus oligothbix, Kuetz. In clear water at Taba- 

 tinga. 



Lyxgbya rufescens, Crouan? On stones from margin of 

 Bio Purus. 



L. guayanensis, Kuetz. Paricatuba, Eio Purus ; and Barreiras 

 de Jutahi, Eio Solimoes. 



L. putealis, Mont. Near Montealegre. 



L. abachnoidea, Kuetz. ? Porto Salvo, Eio Purus. 



Phormidiuai paralleltjm, Kuetz. Jaguarary, Eio Tapajos. 



P. afstrale, Ag. On wet soil at Eetenceao, Eio Purus. 



P. spadiceum, Carm. On the wood of the Crozier Canoe. 



Oscillabia tenuis, Ag., var. calida. Near Obydos and 

 Manaos. 



O. pbixceps, Voucher. Pools in the forest at Parauary, Eio 

 Solimoes. 



O. axtillarum, Kuetz. Damp rotting trees at Pupunha, Eio 

 Jurua; near Obydos. 



O. ameeicana, Kuetz. Near Obydos. 



HypnEOTmtix cyanea, Kuetz. ? Web-like stratum on damp 

 places, Tonantins ; and Pupunha, Eio Jurua. 



H. ltjtescens, Rabenh. Moist cliffs, Thomar, Eio Negro; at 

 Sobral, Eio Purus; and Lago Arapecu, Eio Trombetas. 



II. lateritia, Kuetz., var. keemesina. Moist places at Para. 



H. oliyacea, Kuetz. An olive crust on wet rocks, Eio 

 Tapajos. 



H. thermalis, Rabenh. Moist soil and rocks, Hyutanaham 

 and Paricatuba, Eio Purus. 



H. laminosa, Rabenh. ? Moist places in the forest at Porto 

 Salvo, Eio Purus. 



II. tulpina, Kuetz. Dripping cliffs by the Amazons. 



H. tenuissima, Rabenh. Moist surfaces, Uara, Eio Solimoes. 



Beggiatoa alba, Voucher. South bank, Eio Negro. 



B. abachnoidea, Rabenh. ? Moist spots near Eio Mauhes. 



