1907] HASSELBRING—FORM-STIMULUS IN FUNGI 253 
ina pulvinate fruit-body. The most remarkable result of the experi- 
ment, however, is this: the fruit-body was no longer differentiated into 
a sterile dorsal and fertile ventral surface; the whole pulvinate 
body was covered with tubes characteristic of the hymenial surface 
of this fungus. At the present time it is scarcely possible to distin- 
guish the original dorsal and ventral surfaces of the specimen, which 
has been preserved in alcohol. With the suspension of the differ- 
entiation of dorsal and ventral surfaces, all tendency of the fruit- 
body to produce the normal shelf-like form is of course lost. 
On October 9, 1906, a stick with several growing fruit-bodies of 
P. cinnabarinus was placed in a moist chamber as before, and revolved 
in a dark chamber until December 15. At the same time several 
other sticks with growing fruit-bodies were similarly arranged and 
revolved, without excluding the light. Of all the fruit-bodies used 
in this experiment only one rather large specimen in the dark 
chamber showed any uniform growth.’ This one had grown on the 
upper side of a dead branch, so that it had a somewhat rotate form, 
attached at the center. The sporophore was about 3.5°™ in diame- 
ter. The growth of this plant on the klinostat was extremely slow, 
so that it did not enlarge much. New growth occured along a zone 
on the margin, extending back for about 1°™ over the dorsal surface. 
The result was a tumid thickening of the otherwise somewhat acute 
margin of the pileus. Here again the whole growing zone showed 
the incepts of numerous pores characteristic of the hymenial surface. 
That these were not more developed, as in the former case, is due 
to the unfavorable conditions of growth, for it should be remembered 
that the other fruit-bodies used in this experiment, whether growing 
in light or darkness, made scarcely any growth at all, although they 
remained fresh and normal to all appearances. 
Among the Agaricaceae experiments were carried out with Schizo- 
phyllum commune and some species of Coprinus. 
Pieces of a maple branch containing mycelium of Schizophyllum 
were placed on the klinostat as in former experiments. At the begin- 
ning of the experiment any traces of sporophores visible on the 
5 At the end of the iment it was found that several of the smaller fruit-bodies 
had developed iia —_ in patches, where growth had been resumed on the 
margin and on the upper surfac 
