NOTES ON CYANOPHYCE^. — II. 191 



by Wolle as No. 29 of a collection entitled Fresh AVater 

 Algae of the United States (which will be quoted below as 

 Fresh AVater Algfe of the U. S., (Exsicc), to distioguish it 

 from the volumes with the same title), belongs rather to 

 Stigoiiema informe Kuetz., which includes the Sirosiphon 

 gulfula AVood. AA^olle, however, refers AVood's species to 

 Sirosiphon ligiiicola AVood, which, in turn, is made a syno- 

 nym under Sligonema minulnm (Ag.) Hassall by Bornet and 

 Flahault. Stigonema informe Kuetz. is distiuguished from 

 St. tnrfaceum Cooke by the fact that the cells of each 

 transverse band are larger and less in number in the former 

 as compared with the latter. 



Symphjjosiphon Contarenii is said by AVolle iu his article 

 ou Fresh AVater Algne numbered II, in the Bulletin of the 

 Torrey Botanical Club for March, 1877, (VI ; 139) to be 

 abundant together with Sijm. incrustans Kuetz., " ou rocks 

 exposed to the spray of Niagara Falls." No reference is 

 made to this binomial which seems to be of AVolle's 

 creation, iu the Fresh AVater Algae of the U. S. The 

 Scytonema Contarenii of Rabeuhorst is placed by Bornet 

 and Flahault in the list of " Species Tnquirendce." A 

 specimen distributed by Mr. AVolle in his Fresh AVater Algae 

 of the U. S. {Exsicc.), labelled " Sjjmphijosiphon Contarenii, 

 — Rocks, Niagara, Aug. '76," is referred by Dr. Bornet to 

 Scytonema densum (A. Br.) Bornet. This species has not 

 been credited hitherto to North America, at least, in any 

 authoritative fashion. 



Symphyosiphon incrustans AVolle, (Bull. Torr. Bot. Club, 

 VI ; 139, 1877) has already been referred by Bornet aud 

 Flahault to Scytonema crusfaceum var. incrustans (Kuetz) 

 B. & F. The specimen distributed under No. 51 of AVolle's 

 Fresh AVater Alg;e of the U. S. (Exsicc.) is evidently the 

 same, but no reference to this name appears anywhere in 

 the Fresh AVater Algae of the U. S. It seems, however, to 

 be the same as his Scytonema mirabile (Bull. Torr. Bot. 

 Club, VI; 217-218, 1879; and VI; 284, 1879; also Fresh AVater 

 Algffi U. S.; 255, PI. 187, fig. 1-17, 1887), although it is 



