30 TRAXS ACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



Fig. 9. Ascus containing spores, also paraphyses, of D. calycina, 

 var. Trevelyani, Cooke, — a variety distinguished by the spores 

 being larger than in the type form ; x 400. 



Fig. 10. Section through ascophore of Dasyscyj^ha resinaria; 

 X 40. 



Fig. 11. Asci, spores, and paraphyses of D. rednaria; x 400. 



Fig. 12. Section throngh. Sisco^hove oi Dasyscypha subtilissima ; 

 x40. 



Fig. 13. Asci, spores, and paraphyses of D. subtilissima ; x 400. 



Fig. 14. Sections through ascophore of a minute white Dasy- 

 scypha — sometimes occurring along with D. calycina; x 80. 



Fig. 15. Asci, spores, and paraphyses of ascophore described 

 under Fig. 14; x 400. 



Plate III. 



Fig. 16. Section through conidial-pustule of D. resinaria: 

 xlOO. 



Fig. 17. Conidiophores and conidia of D. resinaria; x 1200. 



Fig. IS. Conidia of D. resinaria germinating; x 1200. 



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

 in the bark, caused by the parasite; natural size. 



Fig. 20. Conidia of the Exosporium; x 1200. 



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

 tinuity of protoplasm between adjoining cells; x 2000. 



Fig. 22. Exosporium cells germinating; x 1200. 



Fig. 23. Entire plants of Exospo7'ium ; x 50. 



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



Fig. 25. Larch branch showing canker caused by Dasyscypha 

 resinaria — th.e Exosporium is still present round the edge of 

 the wound ; natural size. 



Fig. 26. Section through larch wood showing hyphse of 

 Dasyscypha calycina in the cells; x 1200. 



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

 nestling in the axil of each dwarf shoot ; natural size. 



