“THALLOPHYTA 359 
In other species one or more of the kinds of spores may be lack- 
ing. All the different forms of spores may occur on the same 

Fie. 380. Tremella (left) of the order Tremeliales, and Auricularia (right) 
of the order A wriculariales 
The orders Uredinales, Auriculariales, and Tremellales compose the subclass 
Protobasidii. (x 4) 

Fig. 381. Development of a gill fungus, the deadly amanita (Amanita 
phalloides) 
Redrawn after Longyear 
host or the eciospores may be found on one host and the ure- 
diniospores and teliospores on an entirely different host. One of 
the best-known and most destructive of the rusts is the wheat 
