1918] 
BURT—CORTICIUMS CAUSING PLANT DISEASES 123 
places from along the very surface of the leaf a very deli- 
cate transparent membranous structure suggestive of the 
hypothallus of such a myxomycete as Stemonitis but much 
more tenuous and delicate. It is quite possible that this pel- 
licle is a portion of the surface of the leaf, for it does not 
show in all preparations. Fawcett, who had the good for- 
tune to be able to compare with Porto Rican material freshly 
collected specimens of Pellicularia koleroga collected by E. J. 
Butler at the type locality, Mysore, India, stated that the con- 
clusion by Kuijper that the Porto Rican fungus is not Pellic- 
ularia koleroga, would seem reasonable if the possession of a 
gelatinous matrix were necessary to make it that fungus, but 
that the Mysore specimens agreed in every way with those 
growing in Porto Rieo. In his independent redeseription, as 
a Corticium, of Cooke's type of Pellicularia koleroga, von 
Hohnel does not employ the word subgelatinous, which every- 
thing seems to show should never have been used in connec- 
tion with the fungus under consideration. 
This study of the Pellicularia fungus on coffee plants in 
the tropics of America leads to the conclusion that this 
fungus is a Corticium not specifically distinct from Corticium 
koleroga (Cooke) v. Hóhn., and that the description should 
be broadened slightly to comprehend better the specimens now 
known from widely separated regions, as follows: 
Corticium koleroga (Cooke) v. Hóhn. K. Akad. Wiss. Wien 
Sitzungsber. 119 : 395. 1910. 
Pellicularia koleroga Cooke, Grevillea 4:116, 134. 1876; 
Pop. Sci. Rev. 15 : 164. pl. 135. f. a-c. 1876; Linn. Soc. Bot. 
Jour. 18: 461. 1881; басс. Syll. Fung. 4: 149. 1886; Faweett, 
G. L., Porto Rico Agr. Exp. Sta. Ann. Rept. 1910 : 35. 1911; 
Jour. Agr. Res. 2: 231. teat f. 1-3. 1914; Porto Rico Agr. 
Exp. Sta. Bul. 17: 8. pl. 1. 1915.—Erysiphe scandens Ernst, 
A., Estudios sobre las Deformaciones, Enfermedades y 
Enemigos del Arbol de Cafe in Venezuela, 16. pl.. f. 5. 1878. 
Type: in Kew Herb. 
The parasitie vegetative mycelium forms long, slender, 
mycelial strands of rather uniform diameter, whitish or pallid 
