162 Scientific Proceedings, Royal Dublin Society. 



PLATE XIII. 



[Note. — All the figures except fig. 1 were drawn by Miss E. Hensman.] 



Fig. 



1. General view of canker-spot on one-year-old rods of " black 



mauls " (Salix triandra, L.) Drawn by Miss J. Hensman. 



2. Cross-section of one-year-old rod, showing extent of canker 



destruction of tissues. Slightly magnified. 



8. Section of pycnidium of Tetradia salicicola. x 100. 



4. Triseptate conidia of Tetradia, with uniseptate conidiophore. 



x 440. 



5. Section through a group of pycnidia of Macrodendrophoma in a 



canker, x 100. 



6. Isolated bisporous conidia of same, x 440. 



