G. R. Wieland — Williamsonian Tribe. 465 



any other, it must be the Williamsoniae. At least no other has 

 thus far proven of more elemental interest when considering 

 the possible mode of origin of the higher types of modern 

 plants. While far beyond the great structural interest admit- 

 tedly belonging to the group as already known, must lie an 

 alluring held of ecologic study. Indeed, with every variety of 

 stem type from Cycadaceous and palm-like to small freely 

 branched shrubs with the secondary wood zones like Cordaita- 

 leans and foliage suggestive of Marattiaceous ancestry on the 

 one hand but undoubtedly leading into net-veined plants on 

 the other, with both stamens and seeds of strictly Paleozoic 

 aspect but Angiospermous emplacement, with flowers under 

 way of varied reduction and microsporophylls small and stamen- 

 like even in the Trias, with the ever present suggestion of rela- 

 tionship to all the great gymnosperm lines as the most gener- 

 alized type of all, and a probable extension into a vast group 

 of tens of thousands of species occupying the globe at the close 

 of the era of cosmopolitan genera, the Williamsonian tribe truly 

 presents a subject of study broad as the held of Paleobotany. 



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