192 



CALAMOPITYEAE 



[CH. 



pitys Saturni agree generally in structure with the imperfect 

 specimens on which Unger founded his genus Kalymma 1 , so 

 named in reference to the structure of the hypodermal zone. 

 A specimen described by Solms-Laubach as a Kalymma petiole 

 occurs in organic connexion with a stem of Calamopitys (fig. 454, 

 C: a detached petiole is shown in fig. 454, D). The identification 

 by White 2 of this attached petiole with Unger's K. grandis has 

 been confirmed by Scott and Jeffrey. A fuller account of Kalymma 

 (fig. 456) is given on a later page, as the petioles so named belong 

 to more than one species of stem. 



B 



FIG. 455. Calamopitys Saturni. A, stem with leaf-bases; x 5. B, stele 

 showing leaf-trace after emerging from the secondary xylem; x 16. (After 

 Zalessky.) 



In Calamopitys Saturni we have a plant agreeing with Lygino- 

 pteris in the possession of secondary xylem of the manoxylic 

 type and in the structure of the common primary bundles, while 

 it is distinguished from Lyginopteris by the greater number and 

 by the structure of the bundles in the axis of the leaf. 



a veil or covering. 



White (05 2 ) B. p 384. 



