BASIDIOMTCETES. 



155 



(Fig. 159), on which it causes great damage ; C. asclepiadeum, on Vincetoxicum 

 officinale; its fecidia (Peridermium cornui) on the stems and branches of Pinus 

 silvestris. 



50. 

 1 



FIG. 156. Chrysomyxadbieti*: 

 a leaf of the Fir, with 5 clusters 

 of basidiospores( x 4); b branched 

 rows of teleutospores springing 

 from the mycelium (m). 



FIG. 157. Cronartium rlbicola : a mass of uredo- 

 spores ( x 50) ; b an uredospore ; c a column of teleu- 

 tospores (x 60); da small portion of the same 

 more highly magnified, with a basidium and two 

 basidiospores (s). 



To the Fungi of which the aecidium is known, whilst the remaining forms are 

 still undetermined, but which are without doubt hetercecious, belong -Ecidium 

 elatinum, which produces the enormous " witches' brooms " and barrel-shaped 

 swellings on stems and branches of Abies alba; and JEcidium strobilinum 

 (Fig. 158), which attacks Fir-cones, 

 causing all the scales to become 

 covered with clusters of aecidia 

 opening by a lid. Hemileia vasta- 

 trix destroyed the coffee planta- 

 tions in Asia. 



Order2. Auriculariaceae. 



The long, transversely divided 

 basidia bear laterally 4 long 

 sterigmata with basidiospores 

 (Fig. 160 J5) and are united 

 to form an hymenium on the 

 surface of the fruit -body. 

 Parasites or saprophytes. 



FIG. 158. -iEcfduim strobilinum : a scale of 

 cone of Picea excelsa, with numerous aecidia ; b 

 tecidiospores arranged in a series; c a cell 

 of the peridium. 



