BORTHWICK—WARTY DISEASE OF POTATO, 119 
LITERATURE. 
1. K. SCHILBERSKY. Ein neuer Schrofparasit der Kartoffel-knollen, in 
Berichte der Deutsch. Bot. Gesellsch., XIV (1896 
2. M. C. POTTER. A new potato disease (Chrysophlyctis ens 
ae . in ee of the Board of Agriculture, IX, p 
3. R. S. MAcDoUG ew fungus disease of potatoes Cavin: 
anions Schilby Ss in Trans. Highland and Agric. Soc. of Scotland, 
1903. 
4. M. C. Cook in Gardeners’ Chronicle, 3rd Series, XX XIII (1903), 
p. 187. 
DESCRIPTION OF FIGURES IN PLATE XXIII. 
Illustrating Dr. Borthwick’s paper on ‘* Warty Disease of Potato.” 
Fics. 1-2. Diseased tubers shrivelled and dried up. 
Fic. 
Fig. 
cesT 
— 
8 8-9 2 
SIAN S yw 
. Haulm and offset with diseased leaves and tubers. 
Port on of foliage leaf with excrescences caused by the parasite. 
Leaf in transverse section at an excrescence, 
Diseased tubers preserved in weak alcohol as contrast to Figs. 1 and 2. 
ber in surface section showing numerous sporangia. 
Papilla with sporangia aggregated in the surface layers in median longi- 
tudinal section. 
G. 9. Anes foliage leaf in section, with fungus-sporangia to the left. 
Fic. 10. Portion of Fig. 7 more highly magnified. 
II. Portion of Fig. 8 more highly magnified. 
Fics. 12-18. Tubers in various stages of attack. 
