106 
Journal of Mycology 
[Vol. 11 
€ NOTES ON THE ERYSIPHACEAE OF WASHINGTON. 
BY W. H. LAWRENCE, AGR. COLLEGE, WASH. 
1. Erysiphe cichoracearum DC. 1 —On Artemisia ludo- 
viciana, Aster fremontii, A. pessicae, Eriogonum elatum, Galium 
aparine, G. trifidum, Helenium autumnale, Helianthella doug- 
lasii, Helanthus annuus, Hiracium albiflorum, Hosackia purshi- 
ana, Hydrophyllum capitatum, Nemophila parviflora, and Stachys 
ciliata. 
The forms of E. cichoracearum in this locality apparently 
have larger asci and spores than forms in other localities. The 
asci average 50-96 x 28-64 rnmm. and the spores 25-35 x l 9 ~ 2 ^ 
rnmm. 
Two perithecia on Hosackia purshiana each contained but a 
single ascus. 
2. Erysiphe graminis DC.— On Agrostis exarata, Bro- 
mus marginatus, and var. latior. 
This species is widely distributed throughout the eastern 
portion of the state but is not very abundant. 
3. Erysiphe polygoni DC.— On Clematis ligusticifolia, 
Epilobium sp., Hosackia denticulata, H. parviflora, Hydrophyl¬ 
lum occidentale, Lathyrus maritimus, L. polyphyllus, Lupinus 
leucophyllus, L. sericeus, Mentha canadensis, Pisum sativum, 
Polygunum aviculare, Ranunculus platyphyllus, Thermopsis 
montana (Idaho), Trifolium longipes, T. pratense, T. tridenta- 
tum and Vicia sp. 
Both E. polygoni and Sphaerotheca humili were found grow¬ 
ing together on Vicia sp. E. polygoni is a variable, widely 
distributed and abundant species. 
4. Microsphaera alni DC.— This species occurs in the 
Puget Sound region on Alnus rubra. Occasionally the host is 
infested with both M. alni and Phyllactinia corylea. 
5. Microsphaera alni var. calocladophora Schlecht.— 
This species is abundant on Quercus garryana in the Puget Sound 
region. 
6. Microsppiaera alni var. vaccinii Schlecht.—A rare 
variety on Vicia americana in eastern Washington. 
7. Microsphaera diffusa Cooke & Peck.—On Symphori- 
carpus racemosus. Widely distributed and very abundant. 
1 Salmon (Mono. Erysiphaceae) in giving the distribution of E. 
galeopsidis DC. includes Washington. All the specimens I have exam¬ 
ined have had a few perithecia with asci containing spores. Because 
of the presence of spores all forms have been referred to E. cichora¬ 
cearum nothwithstanding the fact that the haustoria in some cases were 
deeply cremilate-margined. 
