74 Forty-third Annual Report on the 



Puccinia Malvacearum, Mont. 

 Living leaves of hollyhock, ilaUia sylvestris. Geneva. May. F. E. 

 Emery. Lyudonville, G. E. Fairman. This fungus causes a disease 

 in hollyhocks that has sometimes been so severe in Europe as to pre- 

 vent the cultivation of these flowers. 



Puccinia obscura, Schroet. 



Living leaves and stems of field rush, Luzula campeslris. Menands. 

 May. 



Our specimens do not fully agree with the description of the 

 European fungus, but the agreement morphologically is so close that 

 it does not seem advisable at present to separate our plant specific- 

 ally. According to Plowright, " the teleutospores are not formed 

 until August or September," but in our specimens they occur in May, 

 and are intermingled with the uredospores, occurring in the same 

 sorus with them. Mesospores were not seen. The name Puccinia 

 obscura var. vermalis is proposed for this fungus, as it will indicate the 

 principal character wherein it differs from the EurojDean plant. The 

 teleutospores are not more highly colored than the uredospores, 

 though this may be due to their young condition. 



Ustilago Austro- Americana, Speg. 



Living leaves and spikes of Pennsylvauian knotweed. Polygonum 

 Pennsylvanicum. Flatbush. September. Zabriskie. 



•'The spores ooze out in tendrils sometimes six lines long." This 

 is the fourth species of smut that has been found on species of 

 Polygonum in our State. 



Doassansia Alismatis, Gornu. 

 Living leaves of water plantain, Alisma Plantago vai\ Americana. 

 Sharon Springs. July. W. A. Setchell. 



Plasmopara Viburni, n. sp. 



Spots irregular, somewhat indefinite, more or less confluent along 

 the principal veins of the leaves, brown or reddish-brown; hyphse 

 hypophyllous, sparse, inconspicuous, bearing two to four short, nearly 

 horizontal and mostly alternate branches near the top, the ultimate 

 ramuli terminating in two or three sterigmata or subulate points; 

 conidia terminal on the branches, subglobose, ovate or broadly ellip- 

 tical, nearly colorless, generally .0006 to .0008 in. long, .0005 to .0006 

 broad, occasionally .0012 to 0016 in. long. 



Living leaves of arrow \\ooCi,Vtburnum. denlatum. Baiting Hollow 

 Station, Long Island. September. 



