202 



MICROSCOPIC FUNGI. 



CiEOMACEI. 





Spores of one order — 





Simple and free. 





Without appendages, 





Springing from delicate threads 



. Tilletia. 



Produced in separate cells. — 





Deeply seated, pulverulent, 



< 



Ustilago. 



generally nearly black . . 



Superficial, yellow or brown 



. TJredo. 



Not inclosed in separate cells 



. Lecythea. 



With appendages, 





Deciduous 



. Trichohasis, 



Permanent 



Uromyces. 



Compound. 





Irregular 



. Polycystis, 



Subglobose or shell-shaped 



. Tuhureinia. 



Spores of two orders — 





1. Spherical 



2. Cylindrical, septate 



* 1 Coleosporium. 



1. Spherical 



2. Wedge-shaped, compact 



1 Melampsora, 



1. Concatenate, exposed . . 



2. Spherical, concealed . . 



1 Cystopus, 



Tilletia, Tul, 



Spores spherical, reticulated, proceeding from delicate branched 

 threads. 



Tilletia caries. Tul. Bunt; included within the germen ; 

 spores spherical, rattier large, black. — On wheat, filling the grains 

 with dark-coloured spores, fetid when crushed. Autumn. Very 

 common. (Plate Y. figs. 84^—91.) 



Ustilago, Link, 



Plant deeply seated. Spores simple, springing from delicate 

 threads, or in closely-packed cells, ultimately breaking up 

 into a powdery mass. — Berk. Outl., p. 335. 



Ustilago segetum, Ditm. Corn Smut; produced on the 

 receptacle and racliis ; epidermis soon ruptured ; spores loose, 

 njiimtc, glol)osc, black.— On the ears of corn and grasses. Autumn. 

 Very common.. (Plate Y. figs. 98, 99.) 



