UNCINULA 



155 



that the ascigerous fruit was first met with on grapes, both 

 growing under glass and out of doors. This discovery 



vt, 





FIG. 39. Uncimda spiralis. i, fungus forming white mildew- 

 patches on upper surface of vine leaf; 2, portion of vine leaf 

 with fungus bearing perithecia ; 3, mycelium bearing erect 

 chains ol conidia, a, a, and haustoria which enter the cells and 

 absorb food, b, b ; 4, a single conidium ; 5, a perithecium with 

 its curled appendages ; 6, an ascus containing six spores ; 7, a 

 .* free ascospore ; 8, grapes attacked by the fungus. Figs, i and 

 2 somewhat reduced ; the rest highly mag. 



showed the fungus to be Undnula spiralis, Berk, and Curt. 

 (= Undnula necator, Burr.). This fungus is undoubtedly of 



