1918] 
BURT—CORTICIUMS CAUSING PLANT DISEASES 125 
Specimens examined: 
India: Mysore, preparation from the type (in Kew Herb.). 
Porto Rico: Mayaguez, Ғ. L. Stevens, 9488 (in Stevens Herb. 
and in Mo. Bot. Gard. Herb., 54510) ; H. E. Thomas (in Mo. 
Bot. Gard. Herb., 55397). 
Colombia: H. T. Dawe, fragment (in Mo. Bot. Gard. Herb. 
from specimen in Kew Herb.). 
Venezuela: A. Ernst, fragments showing mottled stage and 
continuous fructification respectively (in Mo. Bot. Gard. 
Herb. from specimens in Kew Herb., determined by Ernst 
as Candelillo, Erysiphe scandens). 
In 1907, Stevens published in Seience, p. 724, under the 
name Hypochnus ochroleucus Noack, the preliminary account 
of a Corticium parasitic upon branches and leaves of the 
apple, pear, and quince, in the southern United States; the 
detailed, illustrated account of this fungus was published 
later in Annales Mycologici 7: 49-59. 1909. This fungus is 
closely related in general aspect and morphological structure 
to Corticium koleroga but differs sufficiently in some details 
in the collections which have come under observation so that 
Miss Wakefield and Professor Stevens agree with me in re- 
garding it as a distinct species. In transferring Hypochnus 
ochroleucus Noack to Corticium, it becomes necessary to give 
the species a new specific name, because there is already a 
valid Corticium ochroleucum Bres. In order to bring this 
species in sharper contrast with the preceding, I redescribe 
H. ochroleucus and name it as follows: 
Corticium Stevensii Burt, n. nom. 
Hypochnopsis ochroleuca Noack, Boletim do Instituto 
Agronomico Sao Paulo em Campinas 9 : 80. 1898.—Hypoch- 
nus ochroleucus Noack in Saec. Syll Fung. 16:197. 1902; 
Stevens, Science N. S. 26 : 724. 1907; Stevens & Hall, Ann. 
Myc. 7: 49-59. text f. 1-8. 1909.—Not Corticium ochroleucum 
Bresadola, Fungi Tridentini 2 : 58. pl. 167. f. 2. 1892. 
Vegetative mycelium forms on the twigs roundish or ob- 
long, chestnut-brown sclerotia 3-4 mm. in diameter, and also 
