BASIDIOMYCETES. 



153 



the teleutospores, see page 147. C. senecionis, on the Groundsel ; its aeculium 

 (Peridermhtm ivolffii] on Pine-leaves (Fig. 155 a). Other species on SoncJnis, 

 Petasites, Campanula, Jthinantliaccce. 



Chrysomyxa (Fig. 156) has bright red, branched teleutospore-chains ; each 

 spore developes a 4-celled basidium. C. ledi, on Ledum palttstre ; its fecidia 

 on the leaves of the Fir. C. alietis (Fig. 156), without uredo- and secidio- 

 spores ; teleutospores on the leaves of the Fir. In the first summer, yellow 



FIG. 151. MeJampsora padl: a andb 

 uredospores ; c-f teleutospores, seen 

 from different sides. 



Fig. 152. Pear-leaf, seen from the under 

 side, Kilh"R(esteliacancellata": indifferent 

 ages (a youngest, d oldest). 



FIG. 153. Melampsora lietulina : a 

 uredospores ; b three contiguous teleu- 

 tospores, one of which has developed 

 a basidium with three basidiospores. 

 (x 400.) 



bands are formed on the leaves, and in the following spring the red cushions of 

 spores. 



Cronartium (Figs. 157, 159) has unicellular teleutospores united in numbers 

 to form erect threads or columns; the uredospores are enclosed in a "peridium" ; 

 C. ribicola (Fig. 157), on leaves of Eibes (especially Black Currants) ; its tecidia 

 (Peridermium strobi, or P. klcbahni) on the stems and branches of Pinus strobus 



