Fischer —The Biology of Armillaria mucida , Schrader .. 525 ; 
the usual precautions to ensure purity were observed. It is important 
to note that in the parent culture no impurity presented itself at any time, 
and the subsequent development of normal carpophores of A. mucida 
in it demonstrated that the fungus growing actually was the one: 
desired. 
In two days growth from the inoculated section was perceptible, and 
was of the normal type of white mycelium. Before this had spread further 
than an inch, however, a new description of growth, was seen. The flask 
had been kept in the light by a window, and a plate of smooth tissue 
of a light brown colour, rather of the hue of many of the fructifications 
developed in the light, projected itself above the surface of the mycelium. 
Other similar outgrowths appeared alongside the first, and it seemed as 
if the tissues producing the fruit bodies were unable to form the usual form 
of erect carpophores, but were giving rise to a series of folds standing out 
vertically from the surface (Fig. 26). The mass presented an appearance 
somewhat recalling that of a tremelloid fructification. 
On microscopical examination it was found that the inside of the folds 
consisted of a palisade layer at right angles to its surface entirely resembling 
the basidial layer of the normal hymenium. Many spores of the normal 
shape were scattered about, but none connected with the basidia could 
be seen, nor even, at first, were any sterigmata to be found. After repeated 
cutting of sections, however, some sterigmata were seen, which in no particular 
differed from those of basidia on normal fructifications. 
This abnormal growth progressed somewhat slowly, and very gradually 
spread over half of the available area. Meanwhile the mycelium grew out 
in the opposite direction, and from the latter, on April 8, the first indica^ 
tion of a normal carpophore came to light. Instead of being erect, however, 
it projected horizontally from the side of a cube of bread. By April 24 
it had grown out to a length of 2-J inches, with the distal J inch swollen to 
a club. This swelling no doubt represented what should have been the 
cap, but actually no cap was differentiated. The stipe remained prostrate, 
and the swollen end rested on the bread, where it reverted to vegetative 
growth. At the base, however, and later on at the apex as well, a mass of 
incipient carpophores arose (Fig. 27). Some of these secondary fructifica- 
tions attained a length of i\ inches, but none produced a cap visible to the 
naked eye. Sectioned with the microtome a differentiation into primordial 
pileus and hymenium could be distinguished. No further progress towards 
ripening a fully developed carpophore was made, and the fruit bodies 
drooped and degenerated. Some evidenced a tendency to produce tertiary 
fructifications a little below the apex (Fig. 28) ; eventually they also either 
degenerated or began to grow out into vegetative mycelium. 
From all the above-mentioned facts it seems certain that the abnormal 
fructifications, extraordinary as it may seem, can only be very aberrant 
