CLASSIFIED LIST OF DISEASES 313 



24. The wood shows holes, the branches bear mistletoe : Viscum, 25. 



25. The wood (alburnum) shows a dark blue colour: Ceratostoma 

 piliferum, 224. 



26. Old and young trees die, the roots showing mycelia : Rhizina 



undulata, 123. 



Platanus 



The leaves and young shoots die, or the former become brown along 

 the ribs : Glceospofium nervisequium, 140. 



Populus 



1. The leaves show small yellow blotches, which afterwards become 

 dark brown : Melampsora, 164. 



2. The leaves show yellow vesicular swellings : Exoascus aureus, 



135- 



3. The branches bear mistletoe : Viscum, 25. 



4. The flowers exhibit golden yellow much-enlarged ovaries : 



Exoascus aureus, 135. 



Populus pyramidalis 



The branch and twigs die : Didymospharia populina^ 104. 



Prunus Cerasus 



1 . The leaves are crumpled, and frequently also blood-red in colour : 

 Exoascus Wiesneri, 132. 



2. The leaves become prematurely yellow and die, and remain 

 attached to the tree during winter : Gnomonia erythrostoma, 88. 



3. The branches form witches' brooms : Exoascus Wiesneri, 132. 



4. The cortex bears brown sporophores : Polyporus igniarius^ 201. 



Prunus ddmestica 



1. The flowers show yellowish red fleshy blotches : Poly stigma 

 rubrum, 97. 



2. The fruit forms "pockets" : Exoascus Prum, 131. 



3. The branches form witches' brooms : Exoascus deformans, 132. 



4. The branches show black tuberous swellings : Plowrightia mor- 



bosa, 102. 



Prunus instititia 



The branches form witches' brooms : Exoascus Instititice, 133. 



Prunus Padus 



1. The fruit forms " pockets " : Exoascus Pruni, 131. 



2. The cortex shows canker-spots : Nectria ditissima, 91. 



Prunus spinosa 



1. The leaves show yellowish red fleshy blotches: Poly stigma 

 rubrum, 97. 



2. The fruit forms "pockets " : Exoascus Pruni, 131. 



