Witson: NortH AMERICAN PERONOSPORALES 393 
coloration of the infested area and the less disastrous effect on 
the host; the shorter and more slender conidiophores which form 
a sparse covering to the infested area instead of forming a dense 
felt as in the other American species, and which are more per- 
sistent than is common in the genus; the slightly smaller and 
more elongate conidia. The material collected by Dr. Davis was 
all on a single plant of the host which is rather common in that 
region. Specimens of the type collection are in the herbaria of 
Dr. Davis, of the New York Botanical Garden, and of the author. 
2. BASIDIOPHORA Roze & Cornu, Ann. Sci. Nat. V. 
11: 84. 1869 
Mycelium much-branched ; conidiophores clavate, the apex 
an enlarged indurate axis upon which short, simple, cylindric lat- 
eral branches are borne alternately ; conidia ovate to globose-ovate, 
smooth, hyaline, apically papillate, breaking away with a portion 
of the branch attached ; zodspores biciliate, monoplanal ; oospores 
produced in the tissues of the host in company with the conidio- 
phores ; epispore yellowish- brown, more or less irregularly ridged. 
Type species, Basidiophora entospora Roze & Cornu. 
The species of this genus are easily recognized by the clavate 
conidiophore with its short cylindric fertile branches. The only 
approach to this type of branching among the other members of 
the tribe is in the monotypic Japanese genus Kawakamia Miyabe, 
which is described as having the conidiophores * simple or some- 
times branched without any order, generally only once and that 
not from the base of the conidium, slender and provided generally 
at the tip with a short pedicel-cell, which is more slender than the 
conidiophore,”’ which is ‘‘ swollen at base, and gradually tapering 
toward the tip.’’* 
Key to the species 
Conidiophores tall, reaching 300/ ; conidia ovate ; odspores with 
i i 1. B, entospora. 
pr es. 
Conidiophores short, not over 100/; conidia globose-ovate ; 
odspores with very obscure ridges. 2. B. Kellermani. 
1. BAsIDIOPHORA ENTOSPORA Roze & Cornu, Ann. 
Sci, Nat. V. 11:84. 1869 
Peronospora entospora Berk. & Br. Grevillea 1:20. 1872. 
* Bot, Mag. Tokyo 17: (306). 1903. 
