Plate IV. EQUISETALES 



Calamocladus equisetiformis (Schlotheim) Schimper, from 

 Morris, III., x 2 '3, U I Coll. No. P 1282. 



Annularia radiata (Brongniart) Sternberg. On branches of a 

 Calamites stem, from Mazon Creek, x 2/3, U I Coll. No. P 1283. 



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