592 JUST 



them have changed drastically and various far-reaching proposals for their 

 dismemberment and realignment have been made. Of necessity all new sys- 

 tems of classification proposed for these groups now include both living and 

 fossil members. 



Fig. 1. Reconstruction of Rhynia Gwyiuie-Vaughani Kidston and Lang. Life- 

 size glass model on exhibit in Chicago Natural History Museum, X%. 



The following examples of outstanding structural work on fossil plants must 

 suffice. Although the first psilophytes were described from Canadian deposits 

 almost one hundred years ago, their great morphological and phylogenetic 

 importance was not recognized until the discovery in 1913 of beautifully 

 preserved Old Red Sandstone plants of middle Devonian age found in Rhynie 



