NOTES CN CYANOPHYCE^. — II, 193 



distributed it under Wood's name in Rabenhorst's Exsiccatae 

 (Algeu Europas, No. 2492). The specimens under each name 

 contain a mixture of Scijt. Myochrous (Dilhv.) Ag. and 

 Scyt. mirabile (Dillw.) Bornet. 



Arthrosiphon alatus Rab. appears as No. 59 of Wolle's 

 Fresh Water Algge of the U. S. {Exsicc), from rocks at 

 Niagara Falls. In the final work it appears again as Pefa- 

 lonema alatiim Grev. It had already been described from 

 the same locality by Harvey (Nereis Boreali- Americana, 

 III ; 99-100, PI. 48, A., 1858) The specimen distributed by 

 Dr. Wolle is Scyt (datum (Berk.) Borzi mixed with Scyt. 

 mirahile (Dillw.) Bornet. 



Tolypothrix rupestris Wolle, in the Bulletin of the Torrey 

 Botanical Club (VI; 185, 1877), was described from speci- 

 mens growing upon wet rocks at the Delaware AVater Gap. 

 It does not differ at all from T. tenuis Kuetz., except in 

 habitat and perhaps slightly in habit. The microscopic 

 characteristics are the same, as is shown by an authentic 

 specimen sent by Mr. Wolle at the writer's request, a 

 number of years ago. 



Tolypothrix muscicola, announced as an addition to our 

 flora by Wolle in 1877 (Ball. Torr. Bot. Club, VI; 139) and 

 included also in the Fresh Water Algae of the U. S. (p. 246, 

 PI. 81, fig. 1-4) was distributed by Wolle as No. 39 of the 

 set of Algte already mentioned several times. This specimen 

 is not to be distinguished from T. tenuis Kuetz., while 

 Kuetzing's T. muscicola is referred b}'^ Bornet and Flahault 

 to T. lanafa (Desv.) Wartmann. 



Diplocolon Heppii Naeg., was found first in this country by 

 Mr. Wolle, forming a blackish-brown gelatinous stratum 

 upon rocks at Niagara Falls and was announced by him in 

 the Bulletin of the Torrey Botanical Club for 1877 (VI; 139). 

 The plant appears under the name of Scytonema Heppii. 

 (Naeg.) Wolle, in the Fresh Water AlgfB of the U. S. (p. 260, 

 PI. 195, fig. 1-9 (very poor!). Dr. Bornet writes that since 

 the publication of the " Revision," he has been able to 



