1896] 1H PHALLOIDELZE OF THE UNITED STATES 279 
Examination of the surface of contact of medullary lobes 
(G) of the volva with the cortical layer (C) and the cortical 
plates (C’) shows that the hyphz in this surface now lie in the 
plane of the surface, indicating that, in the great increase in the 
volume of these lobes since the stage of fig. 4, their distention 
(partly due to gelatinous accumulation no doubt) has been 
pushing their surface bodily against the cortical layer. The 
same distention of these lobes has also brought them closer 
together, laterally compressing the masses C’ of fig. 4 into the 
narrower plates of fig. 5, and into still narrower plates in the 
more advanced stage of fig. 6. 
With the further growth of the egg, the medullary surface 
(4, fig. 5) becomes thrown into a very complicated series of | 
folds, causing passages to extend in a labyrinthine manner into 
the main central medullary mass. The cells of the palisade- 
layer facing the deeper lying passages differentiate into basidia 
and bear spores. This portion constitutes the gleba (G/) of 
older stages. Hyphez from the cortical plates penetrate into the 
passages situated in front of the edges of the cortical plates, 
become adnate to the surfaces of the medullary masses (7) form- 
ing the walls of those passages, differentiate into pseudopar- 
enchyma, and prevent the differentiation of basidia and spores 
on the surfaces covered. The pseudoparenchyma so formed 
constitutes the walls of the receptaculum of later stages; the 
medullary tissue (2) enclosed by these walls is the tissue of the 
chambers of the receptaculum, and it gelatinizes and becomes 
torn up in. the elongation of the receptaculum, leaving the 
chambers empty for the most part. The relation of these 
Ussues to each other are represented in fig. 6. At the right the 
ty tissue (z) is shown with its hymenial layer of basidia 
“ vio the cavities or passages of the gleba. Just to the right of 
my veal plate (C’) a column of the receptaculum is develop- 
sa cortical hyphe from C’ have grown into the passages 
ay the medullary masses (¢) and, in contact with those 
ads developing into pseudoparenchyma. The depth to 
€ cortical hyphe have invaded these passages is shown 
