XX EXPLANATION OF THE PLATES. 



a Young top. I In a more mature state. 



c Showing its appearance when it is quite ripe, and throwing the spirals. 



2. Black fungus (probably Prolomyces), in a stalk, slightly 

 magnified. 



3. One patch alone, more strongly magnified. This is found 

 in the tuber, as well as the haulms. 



4. A fungus probably allied to fig. 1. 



5. A fungus with small heads, which resembles the Medusa's 

 head under a powerful micoscrope. 



6. A fungus (probably Botrytis), from the edge of the leaf. 

 The lithographer has rather sacrificed the distinctness of the 

 mode of fructification. 



7. A fungoid growth upon the Aphis vastator, much resembling 

 that found in the scald-head of man. 



PLATE IV. 



FUNGI (Smee), 



All these are highly magnified. 



FIG. 1. The leg of the Aphis vastator, showing a parasitic 

 fungus. 



2 and 3. Delicate fungus often growing upon diseased tubers. 



4. A singular fungus, resembling a rush. I do not know 

 whether it is in a persistent state, and I have only observed one 

 example of it. 



5. A very beautiful and abundant fungus, often to be found on 

 the exterior of decaying tubers, or on a cut section. It is appa- 

 rently of a brown color, like oxide of iron, but under the micro- 

 scope shows this beautiful and distinct form. One of the draw- 

 ings is more highly magnified than the rest. 



6. A fungus (probably Botrytis'), from under-ground stem. 

 This appeared somewhat similar to the Botrytis of Berkeley, ex- 

 cept that the top was more globular. 



7 and 8. Fungi from under-ground stem. 

 9. Fungi from diseased tubers. 



