Larch and Spruce Canker. 



Fig. I I. Asci, spores, and paraphyses of D. resinaria, x 400. 



Fig. 12. Section through ascophore of Dasyscypha sub- 

 til is si ma y x 40. 



Fig. 13. Asci, spores, and paraphyses of D. subtilissima, X 

 400. 



Fig. 14. Sections through ascophore of a minute white 

 Dasyscypha. Sometimes occurring along with D. calycina, x 80. 



Fig. 1 5. Asci, spores, and paraphyses of ascophore described 

 under Fig. 14, x 400. 



Plate III. 



Fig. 16. Section through conidial-pustule of D. resinaria, x 

 100. 



Fig. 17. Conidiophores and conidia of D.resinaria, x 1,200. 



Fig. 18. Conidia of D. rcsiuaria germinating, x 1,200. 



Fig. 19. Exosporium sp. on a larch branch, showing the 

 cracks in the bark, caused by the parasite. Nat. size. 



Fig. 20. Conidia of the Exosporium, x 1,200. 



Fig. 21. Portion of a conidium of Exosporium, showing con- 

 tinuity of protoplasm between adjoining cells, x 2,000. 



Fig. 22. Exosporium cells germinating, x 1,200. 



Fig. 23. Entire plants of Exosporium, x 50. 



Fig. 24. Section of plant of Exosporium, x 80. 



Fig. 25. Larch branch showing canker caused by Dasyscypha 

 resiuaria. The Exosporium is still present round the edge of 

 the wound. Nat. size. 



Fig. 26. Section through larch wood showing hyphae of 

 Dasyscypha calycina in the cells, X 1,200. 



Fig. 27. Part of a larch branch showing an aphis "foundress" 

 nestling in the axil of each dwarf shoot. Nat. size. 



Geo. Massee. 



