122 
On Myosotis verna , Nutt. F. S. Earle, April 24, 1884, Anna, Union 
County, 111. Witli abundant mature oospores in stems. 
§ Leiothecce: Subsection parasitica. 
25. Peronospora corydalis De Bary. Rech. s. le d<5veloppm. de quclq. cliam. 
parasites. <Ann. Sci. Nat., 4 e . s6r., Bot. t. xx, cahier. i, Paris, 1863, p. Ill, (p. 
107 of the reprint). 
On leaves of Fumariaceae. 
On Goryclalis sp. (?). B. T. Galloway, May 6,1888, Rock Creek, Wasli- 
ington, D. C. 
On Dicentra - cucullaria , DO. M. B. Waite, No. 554, April 20, 1889, 
High Island, Montgomery County, Md. With mature oospores in 
leaves. 
26. Peronospora parasitica (Persoon). Fries Sumina veg. scand. sect, post., p. 
493 (1849). 
1796. Botrytis parasitica Persoon. Ohs. mycologicoe pars. I, p. 96, t. 5, figs. 5, a, b. 
On leaves and stems of Cruciferm. 
On Dcntaria heterophylla , Nutt. M. B. Waite, No. 549, April 14,1889, 
Roslyn, Alexandria County, Ya. 
On Dentaria laciniata , Muhl. E. A. Southwortli, April 25, 1891, Rock 
Creek,Washington, D. C. With immature oospores on leaves. B. T. Gal¬ 
loway, May 3,1891, Gairett Park, Montgomery County, Md. With ma¬ 
ture oospores in leaves. M. B. Waite, No. 537, May, 1888, Oregon, Ogle 
County, Ill. Erwin F. Smith, May 8,1889, Still Pond, Kent County, Md., 
with immature oospores in leaves! Some of the conidiophores have a very 
thick unbranched basal portion, as much as 25 p in diameter at the base 
in several cases. J. J. Davis, May 20,1887, Racine, Racine County, Wis. 
With immature oospores in leaves. M. B. Waite, No. 268, June 1, 1888, 
Oregon, Ogle County, Ill. With mature oospores in leaves. W. G. 
Clinton, 18—, Buffalo, Erie County, N. Y. 
On Dr aba Caroliniana Walt. M. B. Waite, No. 269, June 1, 1888, 
Oregon, Ogle County, Ill. With mature oospores in leaves. 
On Sisymbrium canescens Nutt. Francis A. Wentz, summer, 1886 (?), 
Spearville, Ford County, Kans. With nearly mature oospores in stems. 
On Lepidium intermedium Gray. T. A. Williams, No. 287, May 30, 
1890, Ashland, Saunders County, Nebr. With conidiophores on leaves, 
and abundant mature oospores in leaves (!) and stems. 
On Lepidium Virginicum L. M. B. Waite, No. 548, May 28,1888, Ore¬ 
gon, Ogle County, Ill. With mature oospores in leaves. 
On Arabis Holboellii , Hornem. S. M. Tracy, No. 720, August 20,1887, 
Marshall Pass, Saguache County, Colo. 
27. Peronospora potentillae De Bary. Rech. s. 1. d^veloppm. de quelq. champ. 
parasites. <Ann. Sci. Nat., 4 e sdr. Bot., t. xx, Paris 1863, p. 124 (p. 120 of the 
reprint). 
On leaves of Rosaceae, Tribe Potentillae. 
On Geum album Gmelin. E. M. Fisher, No. 68, July 22, 1890, Need¬ 
ham, Johnson County, Ind. 
On Potentilla Norvegica L. E. A. Southwortli, May 1,1891, College 
