74 KANSAS Academy of Science. 



On Helianthus doronicoides Lam. 

 522, May 25, 1884, Manhattan (Exs. Fungi Europaei No. 3278, N. A. F. No. 1403c, 

 both collected May, 1884, Manhattan); 1524, July 27, 1886, Manhattan. 



On Helianthus tracheliifolius Willd. 

 1584, August, 1886, Manhattan; 1581, October 4, 1884, Manhattan; 1900, Septem- 

 ber 26, 1889, Manhattan. 



On Bidens frondosa L. 



963, July 1, 1887, Manhattan; 1899, September 1, 1889, Manhattan. 



On Bidens connata Muhl. 



964, July 11, 1887, Manhattan. 



This is probably our most abundant species. Though so common, no oospores 

 have been found except on Silphium integri folium Mx. (Nos. 1591,1768, 1788, and 

 1898), and Ambrosia trifida L. (No. 1670). 



11. Plasmopara sjo. Pekonospoka Kelleemani Ell. <& Halsted pro tem., in Ellis <fe 

 Everhart North American Fungi, No. 2201. 



Oospores and conidia on leaves of Compositae Tubuliflorae June to August. 



On Iva Xanthiifolia Nutt. 



904, June, 1887, Manhattan; ( Exs. N. A. F. No. 2201, June, 1887, Manhattan) ; 1647, 

 August 20, 1887, Manhattan; 1666, July 4, 1889, Manhattan; B. D. Halsted No. — , with 

 abundant oospores in the folds or ridges, July (?), 1887, Manhattan. 



This S2Decies has not yet been published, but seems to be a Plasmopara allied to 

 P. entospora, from which it differs in having shorter fasciculate conidiophores and 

 almost sessile conidia, which are smaller than in some forms of P. entospora. It is a 

 very abundant and curious species, as yet little understood. 



BREIMIA Kegel, in Bot. Zeit., 1843, p. 665. [Syll., vol. VII, p. 243.] 



Mycelium furnished with vesiculiform or simple clavate haustoria. Conidio- 

 phores many times dichotomously branched, branches umbellate, the ultimate 

 ones ending in a clavate or conical body from which radiate 2-8 short, subulate- 

 conical sterigmatia. Conidia globose, depressed papillate at the apex. Oospores 

 globose, minute; epispore slightly roughened, yellowish or dusky. 



12. Bremia Lactucae. Kegel, in Bot. Zeit. 1843, p. 665, t. 3, fig. B. Pekonospoka gan- 

 GLiFOEMis (Berk.) DeBy. Ann. Sci. Nat., Ser. 4., t. XX, p. 108. Botkytis gan- 

 GLiONiFOKMis Berk., in Journ. Hort. Soc, Lond., vol. I, p. 31, t. 4, fig. 25. [Bull. Bus- 

 sey Inst., vol. I, p. 427; Bot. Gaz., vol. VIII, p. 313; Syll., vol. VII, p. 244, No.816.] 



On leaves of Compositae Ligulijiorae May to July; most abundant May and 

 June. 



On Lactuca Canadensis L. 



1609, May 23, 1889, Manhattan; 1500, May 25, 1885, Manhattan; 1661, June 5, 1884, 

 Manhattan; 1623, June 23, 1889, Manhattan; 1648, July 3, 1889, Manhattan; 1902, 

 October 23, 1889, Burlingame, Osage county. 



PERONOSPORA Corda, Icones Fung., vol. I, p. 20. [Bull. Bussey Inst., vol. I, p. 426; 

 Bot. Gaz., vol. VIII, p. 309; Syll., vol. VII, p. 244.] Mycelium furnished with fili- 

 form or branching haustoria. Conidiophores solitary or fasciculate, arising 

 through stomata of the host plant, cylindrical, many times dichotomously 

 branched, terminal branches mostly acute, incurved or uncinate-subulate. Co- 

 nidia ovate or elliptical, destitute of an apical papilla, germinating by a lateral 

 tube. 



§ Calothecae DeBary. [Syll. VII, p. 245.] Oospores with a verrucose or re- 

 ticulate folded epispore. Mycelium mostly furnished with round, tubular, 

 filiform, branching haustoria. 



