730 



FUNGI 



The teleutospores grow at the apex of vertical brown 

 hyphse, which are arranged in dense clumps or sori (A, Fig. 247). 

 Each teleutospore consists of two cells 

 superimposed, as in Fig. 247. The outer 

 wall of the compound spore is a deep 

 chestnut-brown colour and very thick, 

 especially at the apex. Lining each of 

 the two component cells is a delicate 

 membrane. A germ-pore is present at 

 the apex of the uppermost ceU, and 

 another exists at the side of the lower 

 cell close to the transverse septum. 



The teleutospores remain dormant 

 during winter, and cannot be made to 

 germinate until the following spring. Even 

 at the latter period only those germinate 

 which have been exposed to the ordinary 

 changing 

 climatic con- 

 ditions of 

 winter. 



Teleuto- 

 spores from 

 straw pro- 

 tected in 

 stacks or 

 barns rarely 

 grow. _ , ^ „.....„.,,,„,. 



AX7U ^« rr^^ single teleutospore (enlarged 450 diameters)"; "c, germinated teleutoiore 

 W nen ger- a. comdlophore ; J sterigma ; h basidiospore. 



mina tion 



takes place, a hypha, which develops into a basidium, arises from 

 the germ-pore of each cell of the teleutospore (C, Fig. 247); the 

 upper part of the basidium (a) is usually divided into four cells, 

 and each of the latter produces a delicate sterigma (s), on the 



Fig. 247.—^, Transverse section through a sorus of teleutospores of 

 Puccima graminis Pers., on a wheat stem (enlarged 80 diameters) ; B, a 



