256 Report of the Department of Botany of the 



EXPLANATION OF PLATES AND FIGURES. 



Fig. 4. (Plate V) — Concord Vine in Last Stages of Dead-arm Disease. 

 One arm apparently missing for several years. 

 (No. 3227. Fredonia, N. Y., June 21, 1909.) 



Fig. 5. (Plate VI) — Characteristic Appearance op Vine Affected with 

 Dead-arm Disease. 

 The small blanched and crinkled leaves on the cane at the left are typical. 

 Some leaves on arm at right not full size and some blanched about the 

 margins. Arm at right would have died during the summer or succeed- 

 ing winter. A longitudinal section of trunk and arms is shown in Fig. 6. 

 (No. 3226. Fredonia, N. Y. Photograph made June 24, 1909.) 



Fig. 6. Longitudinal Section of Trunk and Arm of Vine Shown in Plate VI. 



Position of arms reversed. Trunk diseased for several years as shown by 



extent of diseased (dark) area. Relatively small amount of healthy 



conducting tissue of interest as is fact that tissue below surface of the 



ground is healthy. (Figure on p. 254.) 



Fig. 7. Cross Sections of Diseased Niagara Trunk Showing Characteristic 

 Necrotic Effect. (Figure on page 255.) 

 (Natural size. Photograph made Oct. 26, 1908.) 



Plate VII, Fig. 5 — Lesions of Dead-arm Fungus on Shoots. 



Probably from infection of May 28, 1909. Various degrees of infection 

 shown. Shoot at bottom infected at so many points that lesions fused 

 to form continuous blackened area. Longitudinal splitting evident in 

 some cases. 



(No. 3240. Worden. Romulus, N. Y. Photograph made Aug. 2, 1909, by C. N. 

 Jensen.) 



Plate VII, Fig. 6 — Rot of Berries Caused by Dead-arm Fungus. 



Earlier stages (upper left in plate) center about lenticels, differing from 



black rot in that respect as well as in general appearance. Later stages 



can scarcely be distinguished from black rot except by microscopic 



examination. 



(No. 6118. Niagara. Romulus, N. Y. Photographs made Oct. 8, 1912, by C. T. 



Gregory.) 



Plate VII, Fig. 7 — Lesions of Anthracnose Disease on Shoots and Berries. 

 Anthracnose and the dead-arm disease confused by some although lesions 

 are very different. Most conspicuous difference in case of anthracnose, 

 which, on shoots, is usually noticeably elevated. 

 (Vergennes. Portland, N. Y. Photographs made July 24, 1909.) 



Fig. 8. Perithecial Stromata of Cryptosporella viticola. 

 (Found and illustrated by Shear.) 



(.Explanations continued on page following plates.) 



