EUNGI OF IMPORTANCE IN THE DECAY OF TIMBERS. 



13 



Table 3. 



-Effect of drying at different temperatures upon the germination of 

 basidiospores of Trametes serialis and Lentinus lepideus. 





Trametes serialis (spores 2 

 years old). 



Lentinus lepideus (spores 5 

 months old). 



Drying temperature. 



Period. 



Germination 

 (per cent). 



Period. 



Germination 

 (per cent). 





Dried. 



Cheek. 



Dried. 



Check. 



At2S°C. (82° F.) 



[Beginning 



1 week 



2 weeks 



4 weeks 



6 weeks 



50 



30 



18 



1 







50 

 50 

 50 

 50 

 50 



Beginning 



2 weeks 



4 weeks 



6 weeks 



8 weeks 



9| weeks 



Beginning. . 



2 weeks 



4 weeks 



6 weeks 



8 weeks 



9J weeks 



50 

 51 

 24 

 28 

 14 

 



50 

 53 

 22 

 17 

 5 

 



50 

 50 

 49 

 50 

 52 

 50 



At 32° C. (89° F.) 



[Beginning,.. 



1 week 



2 weeks 



4 weeks 



6 weeks 



!ft weeks 



50 

 1 

 1 

 1 

 1 

 



52 

 48 

 51 

 51 

 50 

 



50 

 49 

 48 





51 

 42 

 51 





Trametes serialis (spores 10 

 days old). 



Lentinus lepideus (spores 7 

 months old). 



A.t36°C. (97° F.) 



[Beginning 



JlOdays 



|1.8 davs 



[28 days 



99 

 8 

 1 

 



99 

 45 

 20 

 20 



Beginning. . . 



10 days 



18 days 



28 days 



32 

 20 

 3 

 0) 



32 

 21 





20 



20 



1 Less than 1 per cent. 



Table 4. — Effect of drying basidiospores of Lenzites sepiaria, Trametes serialis, 

 and Fomes roseus at ^0° C. 





Lenzites sepiaria (spores 

 fresh). 



Trametes serialis (spores 

 fresh). 



Fomes roseus (spores 5 

 months old). 



Drying 

 temperature. 



Period. 



Germination 

 (per cent). 



Period. 



Germination 

 (per cent). 



Period. 



Germination 

 (per cent). 





Dried. 



Check. 



Dried. 



Check. 



Dried. 



Check. 



40° C. (104° F.J.. 



[Beginning.' 38 

 llwcek.... 13 

 |20days...J 8 

 [2 months.. 



38 

 39 

 39 

 38 



Beginning. 



1 week 



6 weeks . . . 



76 

 14 



7 



75 

 75 

 70 



Beginning. 

 1 week 



38 

 



30 

 26 





























EFFECT 01 ALTERNATE WETTING AND DRYING 1'1'ON THE VIABILITY OF THE 



BASIDIOSPORES. 



In removing spores from a spore cast on a glass slide, a large 

 mi ruber of the spores dislodged from the slide by the water are left 

 behind. From the point of view of economy of material the ques- 

 tion naturally arose as to whether or not these spores wel once and 

 allowed to dry out again were capable of normal germination- A 



number of tests made upon different lots of spores of varying ages 

 from fresh ones tO those a few weeks old seem to show that alternate 



wetting and drying reduce the percentage of viable spores. In one 



