24 



BIOCHEMICAL SYSTEMATICS 



Basid 

 Myc. 16.0 



Flagell. 0.4 

 Ascomyc. 16.0 (^^1 Bact. 1.2 



Cyan. 1.8 



Perid. 

 1.0 



Fie 2-7. Spherical system of the microcosm, consistmg of an 

 infinite number of concentric "Time spheres." Adapted from 

 H. J. Lam, 1936, with the authors permission. 



1. ENGLER SYSTEM. 



As indicated by Lawrence (1951, pp. 118-120), Engler 

 "attempted to devise a system that had the utiUty and practicahty of 

 a natural system based on form relationships and one that was com- 

 patible with evolutionary principles." However, Engler considered the 

 anriosperms to be polyphyletic, and his arrangements are more an 

 attempt to show progressive complexity in structure rather than a 

 ^hyTgenetic sequence. This system has gained w,de acceptance pr. 

 mi^ily because of its broad and detailed coverage, and the plante m 

 many of the world's major herbaria are arranged accordmg to this sys- 



