(Vol. 13 

 292 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Farlow, 176, and W. G. Farlow (in Mo. Bot. Gard. Herb., 



55249 and 13630, respectively). 

 New York: Karner, H. D. House, comm. by N. Y. State Mus. 



Herb., 14.152; Oneida, H. D. House (in N. Y. State Mus. Herb., 



and Mo. Bot. Gard. Herb., 57452, 57476) ; Warrensburg, C. H. 



Peck, type (in N. Y. State Mus. Herb.) and (in N. Y. State 



Mus. Herb., and Mo. Bot. Gard. Herb., 55771). 

 New Jersey: Newfield, J. B. Ellis, 88, comm. by W. G. Farlow 



(in Mo. Bot. Gard. Herb., 7944). 

 Montana: Evaro, J. R. Weir, J^19, 436 (in Mo. Bot. Gard. Herb., 



14768, 6707). 

 Washington: Hoquiam, C. J. Humphrey, 6400. 



100. C. koleroga (Cooke) v. Hohnel, K. Akad. Wiss. Wien 

 Sitzungsber. 119: 395. 1910; Burt, Mo. Bot. Gard. Ann. 5: 123. 

 /. 1. 1918. 



Pellicularia koleroga Cooke, Grevillea 4: 116, 134. 1876; Pop. 

 Sci. Rev. 15: 164. pi. 135, f. a-c. 1876; Linn. Soc. Bot. Jour. 18: 

 461. 1881; Sacc. Syll. Fung. 4: 149. 1886; Fawcett, G. L., 

 Porto Rico Agr. Exp. Sta. Ann. Rept. 1910: 35. 1911; Jour. 

 Agr. Res. 2: 231. Uxt f. 1-3. 1914; Porto Rico Agr. Exp. Sta, 

 Bui. 17: 8. pi. 1. 1915. — Erysiphe scandens Ernst, A., Estudios 

 sobre las Deformaciones, Enfermedades y Enemigos del Arbol de 

 Cafe in Venfjzuela, 16. pi. f. 5. 1878. 



Type: in Kew Herb. 



The parasitic vegetative mycelium forms long, slender, mycelial 

 strands of rather uniform diameter, whitish or pallid at first, finally 

 fuscous, running along the branches and midrib and veins of the 

 leaves, infecting the leaves and ramifying between the cells of the 

 leaf parenchyma, finally emerging at many points on the under 

 side of the leaf to form minute fructifications which give a mottled 

 appearance to the leaf ; fructifications soon laterally confluent into 

 a thin, arachnoid, perforate membrane covering the under sur- 

 face of the leaf between midrib and principal veins, drying pale 

 smoke-gray, separable in small pieces, composed of loosely inter- 

 woven, hyaline or slightly colored, thin-walled, even, rigid hyphae 

 A]/^-% \i. in diameter, not nodose-septate, running parallel with the 

 substratum, and about 1-3 hyphae thick, branching at right 

 angles; basidia scattered along the hyphae, simple, ovoid, 10- 



