Plate VI. SPHENOPHYLLALES 



These grew in brooklets and had floating stems and 

 wedge-shaped leaves as denoted by the Greek name Spheno- 

 phyllum. No living relatives of this Paleozoic plant order 

 are known. 



1. Sphenophyllum majus (Bronn) Bronn, from Mazon Creek, 



U C Coll. No. 32008. 



2. Sphenophyllum stem, from Braidwood, x 2/3, U C Coll. No. 32009. 



3-6. Sphenophyllum emarginatum (Brongniart) Koenig, from Braid- 

 wood, U C Coll. No. 32074, No. 32089, and No. 32090. 



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