83 
PERONOSPORA PLANTAGINIS N. sp. 
Mycelium parasitic in well-defined yellow areas of the leaf, 
occupying -the entire width and a length of 1-3 cm.; conidiophores - 
usually solitary, long exserted, irregularly 5-6 times dichotomous ; 
ultimate ramulae short, unequal, recurved, 4-12 long; conidia 
narrowly oval or lemon-shaped, pointed at each end, dark, almost 
black by reflected light, brownish violet by transmitted light, 40— 
44x 16-18». Odspore unknown. 
On leaves of Plantago aristata, Auburn, Alabama, May, 1896. 
F. S. Earle. 
PERONOSPORA SEyMOURII Burrill n. sp. 
. Sparse, forming white patches or lines on leaves and stems; 
oospores on floral organs. Mycelium large, distorted, haustoria 
knob-like ; conidiophores slender, seven or eight times dichoto- 
mous, branches flexuous, spreading, tips short or of moderate 
length, subulate ; conidia subglobose to elliptical, variable, 12-18 
by 14-27, brownish; odgonia with firm, rather thick brownish 
walls, reaching 70 in diameter; odspores dark brown, opaque, 
thick-walled, rough, 27-45 Be 
On Houstonia sp. Union and Jackson counties, Illinois, April 
11-28, 1882. (A. B. Seymour.) 
The above description was furnished me by Professor T. J. 
Burrill. Having found what appeared to be an undescribed 
species of Peronospora on Houstonia patens, in Auburn, Alabama, 
I learned by accident that a species had been found on the same 
host many years ago and that its description written at the time 
by Mr. Seymour had laid in manuscript untilnow. The Alabama 
Specimens appear to be the same species, but no odspores were 
found. In the Alabama specimens the conidiophores were about 
400 » long, with a diameter of about 6»; the branching was alter- 
nate, the main branches being 70-90 long and the ultimate 
branches or sterigmata 6-10 1; the conidia were more often ovate, 
21 by 11-14 p. 
POLYPORUS DECURRENS D0. sp. 
‘Mesopous; terrestrial ; pileus nearly circular, 5 cm. in diameter, 
plane or slightly depressed at the centre, brown or bay-colored, 
covered with a thin crust which is glabrous except where it is 
raised at certain points to simulate, when dried, an imbricated sur- 
face ; pores nearly white, forming a layer about 2 mm. deep, de- 
current on the stem and vanishing in faint reticulations just above 
