314 CLASSIFIED LIST OF DISEASES 



Pseudotsuga 



i The young shoots die, and become brown : Botrytis Douglasii, 130. 

 2. The branches bear a "mistletoe," and show witches' brooms: 

 Arceuthobium Douglasii, 30. 



Pyrus communis 



1. The leaves show yellow swellings, which produce aecidia : 

 Gymnosporangium Sabina, 158. 



2. The leaves show vesicular swellings : Exoascus bulletins, 129. 



3. The stem bears brown cushion-like or bracket-shaped sporo- 

 phores : Polyporus ignarius, 201. 



4. The branches bear mistletoe : Viscum, 25. 



Pyrus Malus 



1. The leaves bear yellow swellings, which produce aecidia : Gymno- 

 sporangium tremelloides, 159. 



2. The branches show canker-spots : Nectria ditissima, 91 ; Frost- 

 canker, 293. 



3. The stem bears brown cushion-like or bracket-shaped sporo- 

 phores : Polyporus ignarius , 201. 



4. The branches bear mistletoe : Viscum^ 25. 



Quercus 



1. One- and two-year-old plants wither, and show rnycelial strands 

 and black tubercles on their roots : Rosellinia querrina, 78. 



2. The leaves show vesicular swellings : Exoascus carulescens, 135. 



3. The leaves show round brown blotches : Sphcerella, 88. 



4. The cortex shows canker-spots : Nectria ditissima, 9 1 ; Frost- 

 canker, 293. 



5. The cortex of young oaks dies over large areas of the stem, and, 

 should the trees have survived, a callus forms along the margin of the 

 wound : Aglaospora Taleola, 99. 



6. The wood is dry, and shows red-rot : Polyporus sulphureus, 200 ; 

 Fistulina hepatica, 206 ; Dcedalea quercina, 206. 



7. The wood shows white-rot : Polyporus ignarius ', 201 ; Ifydnum 

 diver sidens, 202. 



8. The wood shows red-rot with white stripes : Stereum hirsutum, 

 205. 



9. The wood shows red-rot with white blotches and cavities : 

 Thelephora Perdix, 203. 



10. The wood shows irregular oblong patches of red-, white-, and 

 yellow-rot: Polyporus dryadeus, 201. 



11. The branches bear a deciduous "mistletoe" and prominent 

 swellings : Loranthus europceus, 30. 



