130 KANSAS Academy of science. 



Page 68, line 24 from top, for Lev. read Lev. 

 " " " 5 " bottom, after 158, insert ivith mature oospores. 

 " 70 " 4 « top, after SCLEROSPORA strike out Schroeter, in Cohn 

 Krypt. Flora Schles., Ill Band, S. 236, and insert in- 

 stead (Schroeter) de Bary, Zur kenntniss der Perono- 

 sporeen, in Botanische Zeitung, XXXIX Jahrg., Nr. 39, 

 30. September, 1881, S. 621. 

 " 73 " 17 " bottom, insert before 1641, M- A. Carleton No. 163, June 19, 

 1886, Cloud county; and strike out the same entry 

 from under Ambrosia trifida L., p. 73, lines 10 and 9 

 from bottom. 

 " 75 " 5 " " before Jahrg. insert ♦III, and for p. 251 read i?. 231 

 Nr. 21. 

 " after 80, insert, wilh mature oospores. 

 " " 806, insert, loilh immature oosx)ores, 



top, for Major L. read Rugelii Decaisne. 

 bottom, for Anaggallis read Anaj/allis. 

 " " AnagaZis read AnagaZiis. 

 top, " ErrusA read effusa. 

 bottom, " SoEDiDA read sokdida. 



ADDITIOXS TO THE ORIGINAL LIST. 

 PERONOSPORACEAE de Bary. 

 1. Cystopus candidus (Pers.) Lev. 



On Sisymbrium canescens Nutt. 



1961, on leaves, March 24, 1890, Manhattan; 1962, on leaves, April 4, 1890, Man- 

 hattan; 1963, on leaves, April 28, 1890, Manhattan; 1964, on leaves, with abundant 

 mature oospores in slightly swollen stems, May, 1890 (?). The date of collection of 

 these valuable oospore -bearing specimens is unfortunately somewhat uncertain. 

 The oospores agree very closely with the description and figures given by de Bary 

 Rech. sur le developpment de quelques champ, parasites, in An. Sci. Nat., serie 4 t. XX, 

 p. 131 (p. 126 of the reprint), PI. 2, fig. 2-12. 



On Capsella Bursa-jjastoris Moench. 



1965, collected by M. Varney, on leaves and stems, with abundant mature 

 oospores in the swollen ends of the stems, and in distorted flowers, June, 1890, Man- 

 hattan. 



On Brassica nigra Koch. 



1956, with oospores in swollen stems, petioles and tlowers, no conidia, July 7, 

 1890, Manhattan; 1957, with oospores only in swollen stems and flowers, July 31, 

 1890, Manhattan. This species was fully as abundant as in 1889, and likewise only 

 oospores could be found when the specimens were collected. The oospores do not 

 agree with the description and figures usually given of Cystopus candidus, being often 

 more like those of a Peronospora of the effusa type. A few were furnished with a 

 very finely warted epispore, but none were seen with the characteristic coarse warts 

 found in typical specimens. It may be that the oospores, from being so crowded in 

 the tissues of the parts attacked, stunted each other, since the host-plants them- 

 selves were much injured by drouth. The specimens collected July 4, 1887, (see list, 

 p. 67,) had oospores showing the usual markings. 



