ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 492 



TABLE 2 - MEASUREMENTS OF SPECIMENS OF ARTISOPHYTON MCLAYI 

 FROM ILLINOIS (H:W = height to width ratio) 



Leaf scar 



Outer 



vascular 



bundle 



Height 



Width 



H:W 



Height 



Width 



H:W 



(mm) 



(mm) 





(mm) 



(mm) 





110 



130 



0.85 



75 



102 



0.73 



110 



135 



0.82 



75 



108 



0.69 



90 



120 



0.75 



70 



96 



0.73 



85 



118 



0.71 



80 



95 



0.84 



- 



- 



- 



70 



100 



0.70 



80 



110 



0.73 



52 



87 



0.59 



80 



100 



0.80 



50 



75 



0.66 



85 



94 



0.90 



52 



68 



0.75 



80 



80 



1.00 



55 



67 



0.82 



of A, mclayi and A. goldehbergii , which are similar to each other in 

 outline. A. approximation has the smallest leaf scars of the three, and 

 A. mclayi the largest. Synonymy should not be established until Euro- 

 pean species have been revised. 



./.;' / 



/ / 



/ ' 



A. ins ignis 

 H: W>1 



mis ' • / ,' * / 





/ 



A. mclayi 

 H : W n 



/ 



50 100 



Width (mm) W 



Text fig. 5 - Height to width plot 

 of Artisophyton specimens from 

 Illinois. Dashed line represents 

 a height to width ratio of 1:1. 



