ARCHAEOCALAMITES 71 



fructifications of Archaeocalamites are not yet known in 



the petrified condition. 



Archaeocalamites is a 

 very ancient type of Cala- 

 marian tree, characterised 

 by the non-alternation in 

 successive internodes of the 

 furrows on the casts corre- 

 sponding to the vascular 

 bundles, and also by the 



Fig. 30. — Archaeocalamites radiatus. 

 Branch bearing whorled leaves, 

 which are dichotomouslysubdivided. 

 Half nat. size. After Stur. 



Fro. 31.— Single leaf of the same. 

 Half nat. size. After Stur. 



remarkable foliage, for the leaves were forked, instead 

 of being simple. 1 Fig. 30, from a work by the Austrian 



1 The anatomy of the stem of some species of Archaeocalamites has 

 been worked out by M. Renault and Count Solms-Laubach, and is described 



