156 



ASCOMYCETES. 



Exoascus Rostrupianus Sad. This fungus causes " pockets " 

 on Primus spmosa (sloe) similar to the preceding species. 

 According to Sadebeck, the asci in this case are more slender. 



<^ 



Fio. 49. Reoascus pruni. Malformed 

 Plums "pocket plums"; one which is 

 cut shows the rudimentary stone. 



i natural si/.e. (v. Tubeuf phot.) 



FIG. 50. Exoascus pruni on twig of Pruuv.s 

 Po.dus (at end of July). Four of the ovaries 

 are malformed, (v. Tubeuf del.) 



FIG. 51. Ej-oaxcus prviii. Young twigs of Plum, showing effects of mycelium. 

 The shoots are swollen and distorted, one diseased leaf remains hypertrophied 

 and much crumpled; on one spur a normal and a "pocket" plum are borne. 

 Specimens from the Museum at Geisenheim. \ natural size. (v. Tubeuf phot.) 



