XXXIl] ERISTOPHYTON 199 



Eristophyton Beinertianum (Goeppert). 



1850. Araucarites Beinertianus Goeppert, Mon. Foss. Conif. p. 233, Pis. 42, 43. 

 1872. Araucarioxylon Beinertianum Kraus, in Schimper's Trait. Pal. Vol. II. 



p. 381. 

 1888. Araucarites Beinertianus Goeppert and Stenzel, Abh. K. Preuss. 



Akad. Wiss. p. 30, PI. iv. 

 1902. Calamopitys Beinertiana Scott, Trans. R. Soc. Edinb. Vol. 40, p. 341, 



Pis. i., iv., v. 

 1909 1 . Ullmannites Beinertianus Tuzson, Result. Wiss. Erforsch. Balatonsees, 



Bd I. Teil I. p. 24. 

 1911. Eristophyton Beinertianum Zalessky, Com. Geol. St Petersb. p. 24. 



The pith, 13 15 mm. in diameter, is rather larger than in 

 E. fasciculare and is characterised by the occurrence of dark 

 sclerotic nests surrounded by radially disposed rows of parenchyma. 

 The primary xylem strands are more numerous and smaller than 

 in E. fasciculare and these increase in diameter as they approach 

 the secondary wood. In places the primary xylem elements 

 form a more or less continuous band as in Calamopitys annularis. 



FIG. 458. Eristophyton Beinertianum, A strand of primary xylem, showing the 

 protoxylem, px, abutting on the secondary xylem. (x 35. After Zalessky.) 



The largest leaf-trace bundles at the periphery of the pith are 

 mesarch (fig. 458), but as each trace passes down the pith the 

 reduction in the centripetal xylem is carried further than in 

 E. fasciculare until the xylem-strand becomes endarch in the 

 lower part of its course. The secondary tracheids have usually 

 two contiguous rows of pits and the medullary rays are one cell 

 broad. 



There can be no doubt as to the generic identity of the two 

 1 Tuzson (09). 



