[VoL. 3 
404 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
wood; in fig. 2 the same fructifications are shown after being 
removed from the wood and mounted in water. 
The structure of the fructification is shown by the higher 
magnification of fig. 3. From a layer of hyphae at or near 
the surface of the substratum, hyphae start out together at 
right angles to the substratum and are closely joined in a 
Pistillaria Zeie? 1, two fructifications in dried condition 
on wood, X , the same fructifications in an aqueous mount, 
x63; 3, Ae longitu bur optieal section of a fructification, 
X380; 4, hyphae, showing absence of clamp connections, X64 
5, cluster ‘of young basidia, X640; 6, two База with sterigmata, 
X040; 7, five basidiospores, x 640. 
cylindric column about 60 u long and 20-40 шіп diameter in 
the dried specimens, swelling to 25—50, and rarely 80 y, in 
diameter when the specimens are wet, treated with potas- 
sium hydrate or lactic acid, and mounted in microscopical 
preparations. These hyphae are hyaline, thin-walled, about 
12-2 р in diameter, and not incrusted nor nodose-septate 
(fig. 4). At the outer end of the stem the hyphae pass into 
the pileus which is distinguishable from the stem by its 
obversely conical form, as shown under a magnification of 
380 diameters in fig. 3. The obconical form of the pileus is 
due to repeated branching of its hyphae as they extend 
directly from the stem to the surface of the pileus. The 
manner of branching and of increase in diameter of the pileus 
is shown in figs. 3 and 5. At the outer peripheral end the 
terminal cell of each hyphal branch becomes swollen with pro- 
