[VoL. 3 
444 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
act as conidia when isolated. In the superficial mycelium they 
are larger than where submersed in agar, and are often found 
in the medallion mycelium in the decayed wood. 
In the cultures on blocks of pine wood the mycelium spreads 
well if the blocks are fairly well saturated with water. As the 
moisture disappears the mycelium usually penetrates, and the 
superficial mycelium dries and vanishes. In this later stage 
of growth, however, it is difficult to see whether the blocks are 
well infected or whether the fungus has failed to enter and 
thus has dried down. In the woody tissues the hyphae extend 
lengthwise of the tracheids as a general rule. The medullary 
rays are usually full of matted hyphae. When passing from 
one tracheid to another the hyphae penetrate the pits. Very 
infrequently, however, they penetrate the walls of the spring 
wood, and in such cases are constricted in the tiny perfora- 
tion, but are swollen, forming a callus on either side of the 
wall. When two active hyphae come together laterally they 
fuse, and the whole often forms an anastomosing network. 
The medallions are extremely common. 
CHARACTERISTICS OF THE SPOROPHORES IN CULTURE 
Well-differentiated sporophores were formed on sawdust 
and pine blocks, and in a few cases sporophores occurred on 
agar. The earliest fruiting bodies appeared about seven 
months after the cultures were inoculated, and were the- 
lephoroid or staghorn-like in shape. The flattened projections 
bear the hymenium on both sides. It is composed of clavate 
paraphyses with the typical four-spored basidia. Still better- 
differentiated sporophores were produced in from eleven to 
twelve months, their form depending upon the surface of the 
substrate. Ona horizontal surface they are almost sessile and 
hemispherical, with the upper surface composed of tiny dae- 
daloid pores, while the under surface has the typical lamellate 
hymenium of Lenzites. When fruit bodies appear on the side 
of a block they tend toward the bracket form, but have 
hymenium above and below, the upper poroid, the lower lamel- 
late or hydnoid. Plate 8 shows sporophores both on sawdust 
and on pine block cultures. 
