306 The Botanical Gazette. [August 
galls. Spores aggregated in very different manner into balls 
of 2 to 7 cells or isolated, longish or isodiametric,’ flattened 
on the sides of contact, pale, densely verrucose. Dimensions 
of the spore cells 12-15 x 7-13. 
On Atriplex spec. Los Angeles, Calif., Sept. 1893, leg. 
Dr. A. Davidson. This is a very remarkable fungus on ac- 
count of its peculiar appearance, represented in plate XXIX, 
fig. 5. The arrangement of the spore cells is a very variable 
one. In bicellular spores the cells touch each other by their 
longer sides, or the plane of separation is inclined (figs. 74, 7). 
In three-celled spores the cells are arranged into a triangle 
(7¢) or into a straight line or in an intermediate manner (74). 
If the spore ball is four-celled, the component cells are situ- 
ated across in the same plane (7e), or may be arranged in @ 
different manner (7f). Likewise in aggregates of more than 
four cells, these may lie in the same plane (7g) or forma 
nearly spherical body (7%). More than seven cells in one 
spore ball have not been observed; the most frequent case 
are two to four cells. The spores are produced within s 
‘ pisiform receptacles walled by a few layers of parenchym- 
atous cells of the host plant. The formation of the spores 
begins in the center of the galls and gradually proceeds out 
wards. In the more advanced conditions the interior W: 
of the cavity is covered with a stratum of hyphe whose IY 
nermost beds are transformed into a gelatinous mass forming 
the spores (see figs. 6 and 8). a 
Peronospora phlogina D. & H., n. sp.—Conidiophe! 
erumpent in whitish afterwards dirty flocks from the ps 
surfaces of the leaves, five to seven times bifurcated, sc ee 
minal branchlets slightly curved. Conidia ovoid, 2 a 
20H, nearly colorless, in masses appearing dirty ee’ ae 
smooth. QOospores spherical, 32-484 diam., coarsely 
cose, yellow brown. 388, leg: 
On Phlox divaricata. Decorah, Iowa, June 190% 
Holway. 
Leipzig, Germany. 
EXPLANATION OF PLATE XXIX. wat 
: o iana.-Fig. et ee 
Fig. 1, Puccinia areolata.—Fig. 2, Puccinia Treleasiana. Jn Davie 
g. 
5-8, To | 
Sonii.—Fig. 5, A diseased twig of Atriplex (with broken (6% 
Part of a section through a gall. x250.—Fig. 7, Spores. X5 
spores, 
