44 mcEoscopic bungi. 



The result of these investigations shows *3i»t the 

 bean-rust {Uromyces appendiculatus) , besides sper- 

 mogones, possesses four sorts of reproductive or- 

 ganSj which all serve to propagate the species, but 

 that one alone of them produces it iu a form always 

 identical, whilst the others present weU-marked 

 alternations of generation. Hence it is concluded 

 that there are, 



I. Spores which produce in germinating the pro- 

 mycelium, and 



II. Sporidia. — These give place to a myceHum, 

 which bears afterwards — 



in. Mcidiwm. — Particular organs which engen- 

 der stylospores, and which produce — 



IV. Uredo, the second form of the stylospores, 

 and later, spores (No. I.), which are always asso- 

 ciated with Uredo in the same pustule. The spores 

 and stylospores of Uredo come also upon the old 

 myceUum, which has previously produced JEcid/i/wm: 

 The Uredo stylospores always produce Uredo, and 

 true spores. 



