Twenty-first Annual meeting. 69 



On Ambrosia psilostachya DC. 

 E. Bartholomew No. 347, on leaves, oospores mature, July 27, 1889, Rooks county; 

 M. A. Carleton No. 159, on leaves, stems, and inflorescence, oospores abundant and 

 mature, August, 1886, Cloud county; 1785, oospores and a few conidia on leaves, Au- 

 gust 18, 1889, Manhattan. 



On Ambrosia trifida L. 



1168, on leaves, June 9, 1887, Manhattan. 



5. Cystopus Amaranti (Schw.) Berkeley, Notices of N. A. Fungi, No. 571 in Grev., vol. 

 Ill, p. 58. C^OMA (Ueedo) Amabanthi Schw. Syu. Fung. Am. Bor., p. 292, No. 

 2853. Cystopus Amaeantaceakum Zalewski, in Bot. Centralb., XV Band, S. 223. 

 Cystopus Bliti, Auct. p.p. [Bull. Bussey Inst., vol. I, p. 429; Bot. Gaz., vol. 

 VIII, p. 335; Syll., vol. VII, p. 235, No. 797.] 



Conidia and oospores on leaves of Amarantaceae May to September, most 

 abundant June and July. 



On Amarantus albus L. 

 1605, June 9, 1889, Manhattan. 



On Amarantus blitoides Wats. 

 1602, May 26,1889, Manhattan; 1592, June 8,1889, Manhattan; 1603, June 10, 1889. 



Manhattan. 



On Amarantus retroflexus L. 



1589, June 10, 1889, Manhattan ; M. A. Carleton No. 160, June 11, 1886, Cloud county ; 

 1541, June 15, 1886, Manhattan; 1622, oospores abundant, mature, June 29, 1889, Man- 

 hattan; 962, oospores mature and very abundant, conidia very scarce, July 8, 1887, 

 Manhattan; 1511, oospores mature, abundant, conidia wanting, July 8, 1887, Man- 

 hattan; 962a, oospores mature, conidia very scarce, July 9, 1887, Manhattan; 1514, 

 July 18, 1887, Mound City, Linn county; 1769, July 27, 1889, Manhattan; 426, July 

 31, 1883, Manhattan; 1660, August 2, 1883, Manhattan; 1874, with mature oospores, 

 September 8, 1889, Manhattan. 



I have followed Zalewski* in separating this species from Cystopus Bliti (Biv.) 

 De Bary. 



PHYTOPHTHORA De Bary. Researches into the Nature of the Potato Fungus, in 

 Journ. Roy. Ag. Soc, second series, vol. XII (1876), pp. 239-269. [Bot. Gaz., vol. 

 VIII, p. 309; Syll., vol. VII, p. 237.] 



Mycelium growing in and killing the cells of the host, furnished with but few 

 if any haustoria; conidiophores usually sparingly branched. Conidia at first 

 acrogenous, then produced on the sides of the conidiophores; ovate, papillate at 

 the apex, producing zoospores. Oospores globose, epispore rather smooth, 

 brown. 



Phytophthora infestans (Mont.) De Bary, Researches into the Nature of the Potato 

 Fungus, in Journ. Roy. Ag. Soc, second series, vol. XII (1876), pp. 239-269. 

 BoTBYTis INFESTANS Mout. Mem. r Inst., 1845, p. 113; Syll., p. 302. [Bull. Bussey 

 Inst, vol. I, p. 426; Bot. Gaz., vol. VIII, p. 309; Syll., vol. VII, p. 237, No. 802.] 



This species, the cause of "Potato Rot," has not, to my knowledge, been col- 

 lected within the limits of Kansas by any mycologist. It is, however, reported 

 from Iowa,"!" ^^^ ^^ the Annual Rep. of the Dept. of Agriculture for 1888: Rep. 

 of the Chief of the Sec. of Veg. Path. A map showing the distribution of the 



* Bot. Centralbl. 1. c. 



t Bull, from the Bot. Dept. of the Iowa Ag. Coll., 1886; Bull. No. 1 from the Lab. of Nat. Hist, of the 

 State Univ. of Iowa (1888). 



