BASIDIOMYCETES. 



155 



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

 officinale ; its aecidia (Peridennium cornui) on the stems and branches of Pinus 

 silvestris. 



FIG. 156. Clirysoinyxa dbietis : 

 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 ribicola : 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 seeidium is known, whilst the remaining forms are 

 still undetermined, but which are without doubt heteroecious, belong JEcidium 

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

 swellings on steins 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 B} and are united 

 to form an hymenium on the 

 surface of the fruit -body. 

 Parasites or saprophytes. 



FIG. 158. JEcidium strolilinum : a scale of 

 cone of Picea excelsa, with numerous secidia ; 6. 

 secidiospores arranged in; a series; c a cell 

 of the peridium. 



