TIJE MINNESOTA SEASIDE STATION. 



203 



Not onh^ did they prove of unusual taxonomic interest — some entirely 

 new species being collected — but also well worthy of careful ecological 

 research. Their zonal distribution, formation groups and choice of spe- 

 cial substrata were noted, together with their behavior at different stages 

 of the tide. Often very sharp lines of demarcation between different 

 algal societies were exhibited. In Figure 8 an excellent example is re- 

 produced. At the rear, near the center, is seen the characteristic fringe 

 of salal (Gaultheria shallon) in front of which Enteromorpha colonies 

 are established npon the flat sandstone. In the foreground appears a 

 sharp zone of wrack (Fucus evanescens). In this view there is also 

 shown some of the unusually vigoro;:s epiphytic moss-vegetation so 



Fig. 13. In the Foreground are seen Phyllospadix scotj^kki, La.minaria bongardiana 



AND LESSONIA LITTORALIS, THE LATTER BEING A CHAKACTERIS lIC 



Surge 1'lant of the Coast. 



abundantly represented on ^'ancouver island. Another very distinct in- 

 stance of zonal distribution is shown in Figure 9, the photograph having 

 been taken at low tide. In the foreground the slender leaves of a marine 

 angiosperm (Phyllospadix scouleri) are seen, spread over which are 

 fronds of Egregia, one of the most notable of the west coast kelps. The 

 sides of the dome-shaped rock are draped with kelp, principally Egregia 

 and Alaria, while the top is covered with a fairly uniform and copious 

 growth of the alga which has passed under the name of Halosaccion 

 bydrophora, but concerning which it is possible that an error has been 

 made by American phycologists. 



Under other topograpliie conditions the zonal distribution is not so 



