FUXGI OF IMPORTANCE IK THE DECAY OF TIMBERS. 
25 
III. Chlamydospores present, but no oidia. 
A. Mycelium tough, brownish in old agar cultures; with abortive fruit 
bodies, especially in plate cultures ; covers 10-cm. Petri dish in 12 days 
at 28° C. ; aerial chlamydospores often showing contraction of the 
protoplasm and formation of thick secondary walls ; usually having a 
strong aromatic odor Lentinus lepideus. 
B. Mycelium white ; no abortive fruit bodies ; covers 10-cm. Petri dish in 
seven days at 28° 0. ; chlamydospores more abundant in submerged 
mycelium Tra metes serialis. 
EFFECT OF TEMPERATURE ON THE GROWTH OF THE MYCELIUM. 
The tests on the effect of temperature upon the growth of the my- 
celium were made on malt agar in 10-centimeter Petri dishes. The 
<?3 
3 /e 29- <3% 
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Fig. 
-Effect of temperature upon the growth of the mycelium upon malt agar (shown 
in millimeters of radial growth from the inoculum). 
inoculum consisted of a block of agar 8 to 10 millimeters square, with 
its mycelium, cut from the young growth of a previously prepared 
Petri dish culture. This transfer was deposited upon the surface 
of the agar in the center of the dish. Growth was measured in 
millimeters radially from the edge of the inoculum. The results of the 
tests upon the five fungi are given in figure 2 and in Plate VII. For 
Lenzites sepiaria the optimum lies at 30° to 34° C. (85° to 93° F.). 
At 3° and 8° C. (37° and 46° F.), there was no noticeable growth 
in 8 days, and after a month there was no growth at 3° C. and 
only a millimeter or two at 8° C At 40° C. (104° F.) results varied. 
Occasionally there was no noticeable growth until after 18 days, when 
it varied from 1 to 3 millimeters ; at other times 1 to 5 millimeters was 
evident in 8 days. No growth took place at 44° C. (111° F.). Falck 
(15. pp. 127-129) obtained somewhat different results for this fungus. 
