Armillaria mucida , Schrad. 507 
der Mykologie ’), so that a sufficient supply of carpophores in all stages of 
development could be secured without difficulty. 
I embrace this opportunity to express my best thanks to Professor 
J. B. Farmer, F.R.S., at whose suggestion this study was undertaken, 
for his kind encouragement, and to acknowledge my indebtedness to his 
valuable advice. 
Literature quoted. 
1 . Atkinson, G. F. : Development of Agaricus campestris . Botanical Gazette, vol. xlii, 1906. 
2 . De Bary : Morphologie und Physiologie der Pilze. 1886. 
3 . Fayod : Prodrome d’une histoire naturelle des Agaricinees. Ann. Sci. Nat., Bot., vii, 9, 1880. 
4 . Goebel : Outlines of Classification and Special Morphology of Plants. English edition. 1887. 
5 . Hartig, R. : Wichtige Krankheiten der Waldbaume, &c. 1874. 
EXPLANATION OF FIGURES IN PLATE XXXV. 
Illustrating Mr. Fischer’s paper on the Development of the Fructification of Armillaria mucida , Schrad. 
Fig. 1. Young stage showing loose texture in centre of the undifferentiated sporophore. x about 35. 
Fig. 2. Subcuticular palisade layer forming the primordium of the pileus. x about 35. 
Fig. 3. The same enlarged to show details of structure and the velum universale, x about 470. 
Fig. 4. Somewhat further accentuated palisade tissue, x about 470. 
Fig. 5. Sporophore showing primordium of the hymenium, the gill cavity and the lacunar 
texture of the subcortical tissue covering the stipe, x about 35. 
Fig. 6. Further stage — the universal veil beginning to disintegrate, x about 35. 
Fig. 7. The same enlarged to show details, x about 470. 
Fig. 8. The universal veil and loose tissue around the stipe have entirely disappeared. The 
neutral tissue is still attached to the margin of the pileus. x about 25. 
Fig. 9. Section through pileus of ripe carpophore to show decomposition of the outer part of 
the palisade tissue to form mucilage, x about 315. 
Royal College of Science, South Kensington. 
May, 1909. 
