i88 
MILDEWS, RUSTS AND SMUTS' 
A. Spores produced in the inflorescence, 
ovary, stamens, etc. 
Ustilago olivacea, Tul. ; Plowr., Ured., p. 277. 
Produced in the ovary, soon powdery, olive-brown, then 
blackish; spores irregular in form and size, angularly 
globose or elongated, pale brownish-yellow or tinged olive, 
wall almost smooth, or minutely spinulose, 5—7 (x diam., 
or 5—16 X 3—5 
Syn. Erysihe olivacea, Wallr. 
Uredo olivacea, D.C. 
Caeoma olivaceum. Link. 
In the ovary of Car ex arenaria, C. rostrata, C. riparia, 
C. ampullacea, C. vesicaria. France, Germany, and 
Belgium. 
Ustilago caricis, Fuckel; Plowr., Ured., p. 276. 
Spore-masses black, firm, produced in the ovary, and 
forming a globose, black mass ; spores irregular in shape, 
globose, elliptical or polygonal, often compressed, wall 
dark brown, very minutely granular, 12—24 X 7—20 p. 
Syn. Uredo urceolarum, D.C. 
Ustilago montagnei. Berk, and Broome. 
Ustilago urceolarum, Tul. 
On Carex praecox, C. stellulata, C. recurva, C. glauca, C. 
dioica, C. vulgaris, C. panicea, C. pseudocyperus, C, hirta, 
Rhyncospora alba, R. fusca. Europe generally, Asiatic 
Siberia, N. and S. America. 
Ustilago nuda, Jensen. 
Spore-masses formed in the ears of cultivated barley, 
the whole ear soon becoming covered with a black powdery 
mass that is soon dispersed ; spores subglobose to elliptical, 
olive-brown, smooth, 5^—9 p. 
Syn. Ustilago segetum, Dittm. (in part) ; Plowr., Ured., 
p. 273 (in part). 
Attacking the ears of cultivated barley— Hordeum vul¬ 
gar e. This parasite is commonly known as “ loose smut 
of barley,” whereas Ustilago hordei is called “ covered 
smut.” Both are at times very destructive to cultivated 
barley. The present species infects the host-plant during 
the flowering stage, through the stigma. 
Ustilago hordei, Jensen. 
Spore-masses formed in the ovary, remaining hard and 
persistent, and not becoming powdery, black, being sur 
rounded by the unbroken wall of the grain for a long time ; 
spores subglobose, blackish-brown, smooth, size somewhat 
variable, 6—9 p. 
