THE BEGINNINGS OF LIFE. 



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159 



dencies which may enable it ultimately to unfold into 

 one or other of the filamentous Alg^i. 



On the other hand it must not be forgotten, that 

 however close the alliance may be between Fungi and 



1 



Alg^5 the relationship is perhaps even closer between 

 Fungi and Lichens^. This is the opinion of the Rev. 

 M.J. Berkeley^ who has included both under the com- 

 mon designation ^^Mycetales,' and Professor Lindley 

 also said that Fungi and Lichens are <^so closely allied 



that it is often difficult to tell to which division some 

 given species may belong.'' Dr. Lauder Lindsay, more- 



roup, provision- 



over, states ^ that ^ there is a large 

 ally termed " Fungo-Lichens/' which have the cha- 

 racters equally of Fungi and Lichens, and which it is 

 at present impossible to assign preferentially or exclu- 

 sively to either family.^ Some of the septate and 

 compound spores which I have found in ammonic 

 tartrate and sodic phosphate solutions are almost 

 precisely similar to some spores of West Greenland 

 Lichens which are depicted in Dr. Lindsay^s very 

 interesting memoir 4. But the relationship between 

 Algx and Lichens is just as close. According to Fries, 

 indeed. Lichens are types of Algals born in the air, 



^ The interchangeability of the two modes of growth will be sub- 

 stantiated by further evidence in subsequent chapters. 



^ 



^ See Appe?idix D, p. Ixxvi. 



^ 'Trans, of Linn, Soc.' vol. xxvii. (1871)5 P- 3o8- 



* Compare also his Fig. 13-16 of PL 51 with my Fig. d. of Appen- 

 dix A. 



