186 CONIFERALES 



tracheids, contiguous, alternate, and often slightly flattened 

 (fig. 714, B). The medullary rays have usually 5 8 elliptic* 

 pits in the field (fig. 714, A). 



Dadoxylon (Araucarioxylon) pseudoparenchymatosum Gothan. 



A species from Tertiary or possibly Upper Cretaceous rocks 

 in Seymour Island (S. lat. 64 16') 1 agreeing closely with the wood 

 of recent Araucarineae. The annual rings are distinct ; there are 

 1 2 rows of pits on the tracheids 10 12 fi in diameter; the 

 medullary rays, 2 10 cells deep, are usually uniseriate and there 

 are several small oblique pits in the field. Cross-bars 2 (Mliller's 

 'querbalken') like those described in Araucaria brasiliensis occur 

 in some of the tracheids. 



Dadoxylon Doeringii Conwentz 3 is a Patagonian species of Sub- 

 Oligocene age characterised by distinct annual rings; rays up to 

 40 cells in depth, with 1 2 pits in the field. Among other Ter- 

 tiary species are Dadoxylon aegyptiacum Unger 4 , recorded from 

 several localities in the Libyan desert; Dadoxylon Robertianum 

 (Schenk) 5 of Tertiary or possibly Cretaceous age from the pro- 

 vince of Nagpur, India; Araucarioxylon koreanum (Felix) 6 from 

 Korea, characterised by the occurrence of a single row of con- 

 tinuous pits on the tracheids, is referred by Gothan to the genu 

 Xenoxylon and regarded as identical with X. latiporosum 7 . 



II. CUPRESSINOXYLON. Goeppert. 



The name Cupressinoxylon 8 or, as written by Kraus, Cupres. 

 xylon 9 , is usually applied to fossil wood exhibiting the followin 

 features : Annual rings well defined, often narrow ; vertical rows 

 of parenchyma, often containing resin and recognisable by their 

 dark contents even in transverse section (fig. 715, A), scattered 

 through the spring- and summer-wood. Bordered pits on the 

 tracheids usually separate and circular and if in more than one row 

 opposite; medullary-ray cells generally characterised by the 

 presence of several small pits in the field. Used in this sense 



1 Gothan (08) p. 10, PL i. figs. 1216. 



2 See page 135. 3 Conwentz (85) p. 16. 



4 Unger (59); Schenk (80) p.*3, Pis. i., n. 



5 Schenk (82 2 ). 6 Felix (87) p. 518. 



7 Gothan (10) p. 23. 8 Goeppert (50) p. 196. 



9 Kraus in Schimper (72) A. p. 374. 



