♦ 



1 9 2o] DO UGLA S—INOC YBE 2 1 7 



but as yet only primordia of basidia and paraphyses, had formed 

 on the half mature gill salients. 



Summary 



1. Basidiocarps are developed from young buttons of funda- 

 mental tissue, within which is organized a growing region of very 

 densely interwoven hyphae of small diameters. By progressive 

 growth the stem is first formed, and later, at the stem apex, the 

 pileus fundament, while the ground tissue on the outside becomes 

 the blematogen or universal veil. No marginal veil is formed. 

 The blematogen is finally completely lost or becomes concrete 

 with the pileus. 



2. The gills develop as previously described for forms of the 

 Agaricaceae (not of the Amanita type). In the furrow between 

 the pileus and stem fundaments a dense irregular hymenophore 

 primordium is formed, which is soon replaced by an even palisade 

 layer. Crowding of the elements in the palisade layer, due to 

 excessive branching, causes the surface to be thrown outward into 

 folds, which are then carried downward by the elongation of hyphae 

 of the layer subjacent to them. The ridges develop from the 

 stem centrifugally in regular radial rows. Later secondary gills 

 form in a similar manner between them. 



In conclusion I wish to express my appreciation to Professor 



W 



photographic apparatus in the College of Arts and Sciences. 



1 



N.Y. State College of Agriculture 



Ithaca, N.Y. 



LITERATURE CITED 



1. Atkinson, Geo. F., The development of Agaricus 'campestris. Bot. Gaz. 



42:241-264. pis. 7-12. 1906. 



2. , The development of Agaricus arvensis and A. comtulus. Amer. 



Jour. Bot. 1:3-22. pis. 1 j 2. 1914- 

 3. , Homology of the universal veil in Agaricus: Mycol. Centraibl. 



5:13-20. pis. i-j. 1914. 

 4. , The development of Amanitopsis vaginata. Ann. Mycol. 12:369- 



392. pis. 17-19. 1914. 



