120 
Measurements of sixty conidia are herewith appended. 
Table of measurements of sixty conidia of Plasmopara yonolobi (Lagerheim), Swingle.* 
16-i 
by 
15 
19* 
by 
17* 
22* 
by 
18 
25 
by 
20 
by 
16* 
20 
by 
17 
22* 
by 
18 
25* 
by 
18 
18 
i>y 
15 
21 
by 
15| 
22* 
by 
19* 
25* 
by 
18 
18 
by 
15 
21 
by 
16* 
22* 
by 
19* 
25* 
by 
18* 
18 
by 
16* 
21 
by 
16* 
22* 
by 
20|- 
25* 
by 
19* 
19* 
by 
14i 
21 
by 
17* 
28 
by 
19 
25* 
by 
19* 
19* 
by 
153- 
21 
by 
17* 
24 
by 
153 
25* 
by 
21J 
19* 
by 
15| 
21 
by 
17* 
24 
by 
19* 
25* 
by 
22* 
19* 
by 
16 
21 
by 
18 
24 
by 
19* 
25* 
by 
24J 
19* 
by 
16* 
21 
by 
18| 
24 
by 
19* 
26* 
by 
21 
19* 
by 
16* 
21 
by 
19* 
24 
by 
19* 
27 
by 
19* 
19* 
by 
16* 
21| 
by 
16* 
24 
by 
20* 
27 
by 
21 
19* 
by 
16* 
213 
by 
18 
24 
by 
21 
27 
by 
21 
19* 
by 
1*5* 
213 
by 
18J 
24J 
by 
183 
34* 
by 
24J 
19* 
by 
16* 
22* 
by 
18 
24a 
by 
19 
42 
by 
26 
18. Bremia lactucae, Regel. Beitrage z. Kennt. einiger Blattpilze. Bot. Zeit., 1843, 
p. 665. 
On leaves of Composite, Tribe 0ichoriaceie. Conidiophores hypo- 
phyllous, on both radical and cauline leaves. 
On Krigia Dandelion, Nutt. F. S. Earle, May 10, 1884, Cobden, 
Union County, Ill. 
On Lactuca Canadensis, L. B. T. Galloway, June 1887, Columbia, 
Boone County, Mo.; W. A. Kellerman, No. 29, June 6 , 1882, Lexington, 
Fayette County, Ky.j M. B. Waite, No. 120 , August 26, 1885, Oregon, 
Ogle County, Ill. 
On Lactuca integrifolia, Bigel. W. T. Swingle, No. 4020, September 
20, 1891, Garrett Park, Montgomery County, Md. 
On Lactuca leucophcea, Gray. W. T. Swingle, No. 4021, October 29 ? 
1891, Bockville, Montgomery County, Md. 
On Lactuca sativa, L. E. A. Southworth, December 8 , 1891, Beeves 
Station, Md. 
On Lactuca (sp. *?). P. H. Dorsett, May 21, 1891, Benning’s Station, 
Md.; F. S. Earle, June 17, 1883, Anna, Union County, Ill. 5 W. T. 
Swingle, No. 4022, September 17, 1891, Sterling, Loudoun County, Va.; 
M. B. Waite, (Herb. Div. Yeg. Path. No. 525), September 27, 1889, Mt. 
Carmel, Wabash County, Ill.; W. T. Swingle, No. 4023, October 25,1891, 
Bethesda Park, Montgomery County, Md. 
PERONOSPORA. 
Corda, leones fungorum liucusque eognitorum, I, p. 20. 
§ Calotliecce. 
19. Peronospora arenariae (Berkeley) Tulasne, Note sur les champignons ento- 
phytes, tels que celni de la Pomme de terre. <Compt. Rend. d. TAcad. d. Sci¬ 
ences, t. 38, 26 Jilin, 1854, p. 1102 and 1103. 
* These conidia were measured from fresh specimens (from Still Pond, Md., coll. 
Oct. 10, 1891) in water by Miss May Varney with a Zeiss F. obj. 3 oc. 169 mm. tube 
length. One division of the eyepiece micrometer equaled 14 fa. The measure¬ 
ments are given in /u’s. 
