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stem are numerous groups of small hexagonal and thick-walled 

 sclerenchymatous cells, arranged in four or five irregular concentric 

 rows. All these elements are surrounded by the solid parenchyma- 

 tous tissue of the stem. The phloem was not preserved in most cases, 

 but figure 2 shows it consisting entirely of thin-walled cells arranged 



Fig. 2. — Cross-section of vascular bundle: sc, sheath; x, xylem; ph, phloem; 

 p, parenchyma; X350 (after Hoskins). 



in such a way as to suggest large sieve tubes with companion cells. 

 These morphological characters warrant the conclusion that the 

 stem belonged to an angiospermic plant of the Monocotyledon 

 branch. Although a comparative study with certain living Mono- 

 cotyledons brings out striking similarities, a more definite statement 

 as to the phylogenetic position of the fossil is postponed until other 

 material can be secured. Therefore the generalized name ''Angio- 



