224 BOTANICAL GAZETTE [SEPTEMBER 
in these downward growing areas in the hymenophore, and the 
first folds in the palisade are the salients of the lamellae themselves. 
In P. flammans and P. adiposa the gill salients are very broad; 
in all 3 species their origin and differentiation is centrifugal and 
their subsequent growth is downward into the gill cavity. 
In conclusion, I wish to acknowledge my deep obligation to 
Professor G. F. ATKINSON, under whose direction this work was 
done, for his unfailing interest and many helpful suggestions. 
CoRNELL UNIVERSITY 
Trmaca, N.Y. 
LITERATURE CITED 
1. ALLEN, CAROLINE L., The development of some species of Hypholoma. 
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2. Atkinson, Gro. F., The deosaunect of Agaricus campestris. Bort. GAZ. 
42:241-264. pls. 7-12. 1906. 
+ -, The development of Agaricus arvensis and A. comtulus. Amer. 
Jour. Bot. 1:3-22. pls. 2. 1914. 
The development of Armillaria mellea. Mycol. Centralbl. 4: 
_ 112-121. pls. 2. 1914. 
» Homology of the universal veil in Agaricus. Mycol. Centralbl. 
St13-10. p Bs. 13. 1914. ; 
6. 
pls. 13-16. 1914. 
es denice! of Amanitopsis — Ann. Mycol. 12: 
369-392. ve 17-19. 1914. 
8. ————, Morphology and development at dissin rodmani. Proc. donk s 
Phil. Soc. 54: 309-343.' pls. 7-13. 1915. 5 
9- , Origin and development o yy ee acter Bor. Gaz. 
&: soi oe as: Back cae 
t Lepiots 7 vb pee, Ann. Mycol. ie dla bs is = 
NY. Bot. Gard. 6: 1916. 
ir. Beer,R oa one Joe Agari ae : 
Ann. Botany 2§:683-689. m 52. 19rr. oe Ce ee 
_-myceten + i. TT. 98-108. de a 1877. oe 
