456 Brooks : The Fruit Spot of apples 



Fig. 3. Section through a green spot of a badly withered Baldwin, showing the 

 thick-walled cells of the surface zone from which has later extended the large mass of 

 shrunken brown cells beneath. The fungus can be seen in the pockets in this shrunken 



tissue. 



Fig. 4. A cross-section of a thirty-four days old inoculation on a Baldwin. The 



mycelium may be seen in the needle path and also closely pressed against the walls of 

 the withering cells, j 



Plate 31 



Fig. 1. A cross-section of an apple to show the location of the large bands of con- 

 ducting tissue. 



Fig. 2. Inoculations and punctures from a Baldwin after fifty days. The two at 



the right are inoculations. 



Fig. 3. A section of an apple of which the cell tissue in the region of the vascular 



system is browned. 



Fig. 4. A section of a typical colony from the walls of a ten days old culture of 

 solution A. The lower side as shown in the plate was attached to the wall of the 

 test tube. 



Plate 32 



Fig. I. A section through an early stage of a red spot. The opening through 

 the epidermis has been enlarged by a breaking of the tissue in cutting. At the nght 

 the small regular cells of the lenticel are replaced by large thick- walled ones. In the 

 pocket that extends into these from above may be seen the granular hyphae of I c 

 fungus. 



Fig. 2. A late stage of the Fruit Spot, showing the stromatic layer of the fung 

 with a conical mass of immature sporophores above it. 



Fig. 3. A later stage of the spot showing the stroma, the shrunken tissue beneat , 



and the sporophores pushing through the lenticel above. 



Fig. 4. A lenticel of an apple with normal tissue beneath it. 

 Fig. 5. Fungus as grown in agar Petri cultures. 



?LATE 33 ontbs 



Fig. I. A section of one of the minute elevations from the stroma of a five mon 



Old flask culture. The pustule-like cavities ate shown in the upper portion. 



Fig. 2. A cross-section of a stroma from a liquid flask culture showing the aj 



•%:j:. ~~j :j- t. 



of conidia and conidiophores. 



Plate 34 



Fig. I. Spores from cultures in solution A. m ^ 



Fig. 2. The same spores after remaining twenty-one hours in Van Tieg c 



FlG. 3. The same spores after forty-two hours. 



Fig. 4. A drawing of a section through an early stage of a fruit spot. 



Plate 35 



Fig. 1. Conidia from a pustule such as is shown in fig. 3, plate 3 

 Fig. 2. Spore production in solution A agar after four days. 

 FlG, 3. Chlamydospores from an old culture. 

 Fig. 4. Germinating chlamydospores. 



Fig. 5. Olive-brown hyphae from a six weeks old liquid culture after ont 

 a Van Tieghem cell. 



Fig. 6. A similar hypha after two days in a Van Tieghem cell. 

 Fig. 7. A sketch of a portion of the vascular system of an apple. 



day 



