306 A TEXTBOOK OF GENERAL BOTANY 
bears from one to twelve or more spores. The mycelium is re- 
garded as the basidium, and the spores as basidiospores. These 

Fia. 374. /Eciospore stages of rusts 
Left, coffee infected with eciospore stage of coffee rust (Hemileia vastatriz) 
(x 4); right, eciospore stage of wheat rust (Puccinia graminis) on barberry 
“leaf (x 1) 
SN 
SS 
.Z Sy Eitiie, 
& LZ \ SM) i 
GI 
IN Wa 2 810 16 dg i bg 
C) = S$ Rod 2 Of ai¢ 
CES 
ES 
x2) 6) 
SESE OLS LES 0) 
i, 

Fie. 375. Leaf infected with sciospore stage of rust 
Above are two pycnia, and below an ecium. (x 165) 
spores, on germination, produce a mycelium which infects the 
host. The smuts are frequently very destructive to agricultural 
crops. One is very conspicuous on corn, and another on sugar cane. 
