62 College of Forestry 
The rate of accumulation of a spore-deposit is dependent 
upon several factors — for example, age of the pileus, 
amount of moisture present and the rate of dessication, tem- 
perature, ete. By moving a pileus from one place to another 
every hour and thus securing successive spore prints, one 
may be convinced readily of the continuity and regularity of 
the spore discharge. Spores which have just been liberated 
always have a fresh and turgid appearance and even liberated 
spores of long standing quickly acquire it upon being placed 
in water for a few minutes. 
WRK 
AWN 
2 
ag 
iS 
Pie. 2. 
Basidiospores of Polyporus pargamenus shown in longitudinal ‘section, 
X 5,000. A. Dorsiventral section, the spore being in lateral position.— 
a, apiculus; y, apex; c, geometrical center; ay, organic axis; #y, geometrical 
axis; Gg, organic section; , ventral spore-half ; Ske dorsal spore- 
half. B. Bilateral section, the spore-half being in ventral position.— a, apical 
spore-half; b, basal spore-half; ¢, geometrical center; wy, geometrical axis; 
, left lateral spore-half; DAE right lateral spore-half. This section 
represents the only symmetry plane possessed by the spore, 
