234 
A. W. BLIZZARD 
the surface. By the enlargement of the cells of these parallel hyphae, 
and the evening up of the hyphal elements, a level palisade layer is 
produced. 
5. The primary lamellae originate as evenly spaced, radial folds 
of the level palisade layer. The first folds that appear are the rudi- 
ments of the primary gills. Their further development is produced 
by the elongation of the subadjacent hyphae of the pileus which push 
their way into the salients and form the trama of the gills. These 
tramal hyphae branch and furnish new elements by which the lamellae 
grow in thickness and at the same time by apical and intercalary 
growth increase in width. 
6. The secondary lamellae arise as down growing salients of the 
palisade layer on the under surface of the pileus near the stipe between 
the primary gills. They develop as do the primary lamellae. 
In conclusion I wish to express sincere thanks to Professor Geo. 
F. Atkinson under whose direction this study was undertaken for 
many helpful suggestions. 
Department of Botany, College of Arts and Science, 
Cornell University 
LITERATURE CITED 
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241-264, pis. 7-12. 1906. 
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Bot. i: 3-22, pis. I, 2. 1914. 
3. . The Development of Amanitopsis vaginata. Ann. Mycol. 12: 269-392, 
pis. 17-19. 1 914. 
4. . Morphology and Development of Agaricus rodmani. Proc. Amer. Phil. 
Soc. 54: 309-343* 8 diagrams, pis. 7-13. 1915. 
5. . Origin and Development of the Lamellae in Coprinus, Bot. Gaz. 61: 
89-130, 8 diagrams, pis. 5-12. 1916. 
6. DeBary, A. Zur Kenntniss einiger Agaricinen. Bot. Zeit. 17: 385-388, 393- 
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7. . Morphologic und Physiologic der Pilze. Flechten, und Myxomycetcn. 
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8. . Vergleichendc Morphologic und Biologic der Pilze, Mycetozoen, und 
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10. Douglas, Gertrude E. A Study of Development in the Genus Cortinarius. 
Amer. Journ. Bot. 3: 319-335, pis. 8-13. 1916. 
11. Fayod, V. Prodrome d'une histoire naturelle des Agaricinees. Ann. Sci. Nat. 
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