postelsia 75 



of the water. The depth at which it is anchored 

 varies from 1-2 meters as a general rule. It 

 seems to prefer a bottom of fine silt or mud where 

 the proportion of sand is not considerable. 

 Under these limiting conditions there are only a 

 few places along the shore of the lake where it 

 has been able to gain sufficient foothold to build 

 up a characteristic society. 



Other aquatic representatives occur but spar- 

 ingly. At the time of the year when the place 

 was visited only two other species were observed 

 growing in the lake. These were CaUitriche 

 paliistris and S parganium minimum. They are 

 found at intervals along shore, generally in shal- 

 low water, and do not seem to show any strong 

 preference as to the nature of the bottom. No- 

 where do they develop in any considerable 

 quantity and must be regarded as outposts of 

 the general lake flora. 



Special adaptations — In forests of such high 

 latitudes as that of Vancouver Island epiphy- 

 tism is generally confined to the lower plants 

 like lichens, liverworts and mosses. The last 

 two groups are particularly abundant in the 



