4-i! UICEOSCOPIC FUNGI. 



The result of tliese investigations sliows tliat tlie 

 "bean-rust {Uromyces ap]^endiculatus), besides sper- 

 mogones^ possesses four sorts of reproductive or- 

 gans, wliicli all serve to propagate the species, but 

 that one alone of them produces it in a form always 

 identical, whilst the others present well-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 mycelium, 

 vrhich bears afterwards — 



III. ^cidiuni. — Particular orsfans which eno-en- 

 der stylospores, and which produce — 



IV. TJredOj the second form of the stylospores, 

 and later spores (Xo. I.), which are always asso- 

 ciated with TJredo in the same pustule. The spores 

 and stylospores of TJredo come also upon the old 

 mycelium, which has previously produced JEcidium. 

 The TJredo stylospores always produce TJredo, and 

 true spores. 



