' 

 58 RELATION OF THE DISEASE TO FUNGI. 



fine lines, but the red part appears opaque. What it is, I 

 do not know. 



(228.) Sometimes in a rotten potatoe we find that there is 

 a sort of growth of a brilliant carmine color, but I have not 

 detected any very definite structure in it. The color is so 

 deep, that it is as intense as carmine, and will bear an 

 equal magnifying power before the color is lost. Under 

 the highest power of the microscope I can only make out 

 minute cells. Its' intensity of color is the prominent fea- 

 ture. 



(229.) There is a magnificent fungus of a brown color, 

 resembling in fact oxide of iron to the naked eye, which 

 fungus may often be seen in the interior of a diseased pota- 

 toe, when its cavity has been exposed to the air. Under 

 the microscope it is found to be a perfect forest, with 

 branches resembling in some degree the regularity of a 

 pine-tree, with a seed-vessel at top of each. It is really 

 and truly a most delightful object for a good microscope. 

 (Plate iv., fig. 5.) 



(230.) There is also a little fungus which appears to 

 have a small top, which a microscope breaks up into a 

 Medusa's head. I think it is the same as that to which the 

 name is assigned ; but I must refer my reader to the faith- 

 ful drawing of my artist. (Plate m., fig. 5.) 



(231.) Almost every stem has a black fungus growing 

 from it, which to the naked eye gives a dotted appearance 

 to it. Under the microscope fine stems are seen to ema- 

 nate from it. I think it is the same as the Protomyces. I 

 have not thought it therefore worth while to figure Mar- 

 tius's drawing, but have given a figure from one of my 

 own specimens. This fungus is also frequently to be 

 found in the tuber. (Plate m., figs. 2, 3.) 



