34° The Botanical Gazette. [December, 



while recorded in Saccardo, is perhaps new to this country. 

 The oospores were in abundance. It was also luxuriant upon 

 Potcntilla Ncpalcnsis, in which also oospores were present. 



Cystopus iPOMCE.E-PAXDURATyE Farl. has been abundant 

 upon the sweet potato foliage and the oospores in the galls of 



wicea bandurata as mentioned last season. In no case 



were the galls found upon the former host. 



CYSTOPUS CANDIDUS (Pers.) Lev. has its long list of hosts, 

 and in this is a match for Peranospara parasifica y hoth frequently 

 growing together upon the same species of Cruciferae. Fine 

 specimens with chalky white patches of large size were found 

 unusually abundant upon some horseradish plants, and in this 

 vicinity during June the shepherd's purse is fortunately quite 

 seriously affected by this white mold. 



Cystopus PORTULACiE (DC.) Lev. in like manner assists 

 materially in killing off the purslane. 



As a whole this has been a year in which the mid-season 

 was characterized by few Peronosporeae, but the quota has been 

 well filled by the rapid development of several species in great 

 abundance late in the season. The frosts of autumn held off 

 unusually late, and this, together with the heavy rains, gave 

 these parasites a good opportunity to make a rank growth. 

 The other points of particular interest have been the finding 

 of F y eronospor a parasitica upon Alyssum maritimum; P. Cu- 

 bensis in great abundance upon cucumber, pumpkin and 

 squash, and quite destructive to watermelons; P. effusa abund- 

 ant upon spinach; and P. Potentilla? upon Potent ilia grandi- 



flora and Potentilla Nepalensis, both hosts abounding in 

 oospores. 



Rutgers College, New Brunswick, Al. % 



New plants collected by W. G. Wright 



B. L. ROBINSON. 



* 



Ayenia Wrightii — Fruticose : branches terete, smooth : 

 leaves ovate, acuminate, rounded at the base, serrate, glab- 

 rous on both sides, a little paler beneath, l|-2 inches long, 

 half-as wide ; some much smaller leaves, 4-6 lines in length, 

 fascicled together with the flowers in the axils of the larger 



