Explanation of Plate I. 



Fig. I. ExoAscLS prlni Fuckel on fruit of Primus domestica Linn. 



Fig. 2. ExoASCCS communis Sadeb. on fruit of Pruiius nigra Art. 



Fig. 3. ExoASCLS farlowii Sadeb. on fruit of P r units serotina Ehrh. 



Fig. 4. ExoA.scLS cera.si (Fuck.) Sadeb. on leaves of Prunus serotina Ehrh. 



