the amazons and it8 teibtttaeies. 125 



Vauchebiace^!. 



Vattchebia ? Belongs to the genus, but too imperfect for 



specific determination. On moist earth, Porto Salvo, Rio Purus. 



ZTGNEMACEiE. 



Spieogyba tbopica, Kuetz. Of very general distribution in 

 the region. 



S. dtjbia, Kuetz., var. longiaeticulata. Hyutanaham, Eio 

 Purus ; and Bio Tapajos. 



S. longata, Kuetz. ? Igarape de Bemedio, near Manaos. 



Mougeotia ? Too imperfect ; along with the last. 



Ztgogonitjm ebicetoetjm, Kuetz. Beach at Manaos. 



Z. PEEUYIANTJM, Kuetz. ? Hard clay rock in a stream at Hyuta- 

 naham, Bio Purus. 



Ztgnema subtile, Kuetz. Beach at Teffe. 



Pbotococcace.5;. 

 Pbotococctts vieidis, Ag. Damp wood at Tabatinga, and at 

 Serpa. 



Limnodictton obscttettm:, n. sp. Thallo mucoso-gelatinoso, 

 luteo-aerugineo ; trichomatibus leniter flexuosis, aequalibus, arti- 

 culis globosis, subarcte connexis, diametro "001 unc. 



Along with Spongilla paulula of Bowerbank, on leaves of Cala- 

 dium arborescens, marshy stream at Obydos. 



Palmellace^:. 

 Baphidium polymobphum, Fres. A form of the European 

 species. A green layer on leaves in stagnant water, Carvoeiro, 

 Bio Negro. 



SCTTONEMACE^!. 



Scytonema ^bxtgineo-ctnebeum:, Kuetz. Dripping clay cliff 

 and on wet stones, Bio Purus. 



Nostochace-e. 



Nostoc l-EVigatuat, Kuetz. Dripping cliff, Barreiras de 

 Maniwa, Bio Purus, and similar places beside the Amazons. 



l2 



