Fischer . — The Biology of Armillaria mucida , Schrader . 535 
Fig. 11. Hypha in drying jelly, x about ioo. 
Fig. 12. Hypha in jelly, x about 300. 
Fig. 13. Curled hypha in jelly hanging drop, x about 400. 
Fig. 14. Clamp connexion, x about 700. 
Fig. 15. Clamp connexion on a hypha from a basidium. x about 475. 
Fig. 16 a, b, c, Hyphae breaking up into rods —oidiai. x about 475. 
Fig. 1 7. Group of incipient carpophores on bread, x about 
Fig. 18. The same 24 hours later, x about b* 
Fig. 19. The same 24 hours older than Fig. 18. x about 
Fig. 20. The same 48 hours older than Fig. 19. x about f. 
Fig. 21. The same 24 hours older than Fig. 20. x about b* 
PLATE XXXVIII. 
Fig. 22 a and b. The same carpophore as in Fig. 21, 24 hours later. Veil much stretched, 
x about b* 
Fig. 23. Mature carpophore, x about b* 
Fig. 24. Group of carpophores grown on a pure culture of bread, x about Photograph 
kindly taken by Mr. J. F. J. Shaw, A.R.C.S. 
Fig. 25. Young carpophores grown in the light ; dark brown with bulbous bases, x about b* 
Fig. 26. Abnormal resupinate fructification, x about b* 
Fig. 27. Aberrant undeveloped prostrate carpophore with secondary carpophores arising on 
basal portion of stipe, x about b* 
Fig. 28. The same 30 days later. Secondary carpophores arising at apex, and indications of 
tertiary ones near apex of two of the secondary carpophores, x about b. 
Fig. 29 a , b, c. Basidia showing sterigmata and development of spores, x about 475. 
Figs. 30 and 31. Discoloration of wood, x about b- 
Fig. 32. Hyphae in the vessels, cell-walls as yet but little affected, x about 475. 
Fig. 33. Advanced stage of attack, hyphae have disappeared and practically middle lamellae 
only remain, x about 475. 
Fig. 34. The secondary layers of cell-walls detached from middle lamellae and swollen and 
contorted, x about 360. 
Fig. 35« Hyphae in cells of large medullary ray. x about 475. 
Imperial College op Science and Technology, 
South Kensington, 
June, 1909. 
