Table 1 . -- Adsorption and desorgtion timelag constants of Cladonia. 

 Adsorption conditions: 80 F. and humidity step change from 

 20 to 90 percent. Desorption conditions: 80 F. and 

 humidity step change from 90 to 20 percent 



Timelag period : Adsorption replicates : Average timelag constant 



: 1 2 3 : 



Minutes Minutes 



1 



50 



55 



30 



45 



2 



80 



115 



100 



98 



3 



140 



120 



90 



116 



4 



120 



90 



60 



90 



5 



110 



70 



20 



67 



Average 



100 



90 



60 



83 



Timelag period 



Desorption replicates 



_l 2 3_ 



Minutes 



Average timelag constant 



Minutes 



50 

 85 

 95 

 45 

 30 



42 

 53 

 67 

 43 

 20 



42 

 45 

 48 

 35 

 25 



43 

 61 

 70 

 41 

 25 



Average 



61 



45 



39 



48 



„ 80 



I 



i 



I 



2 3 

 Timelag period 



= Adsorption 

 V Desorption 



Figure 2. — Adsorption and desorption timelag periods of reindeer lichen. 



3 



