186 CONIFBEAIES l^^' 



tracheids, contiguous, alternate, and often slightly flattened 

 (fig. 714, B). The medullary rays have usually 5—8 elliptical 

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

 Dadoxylon {Araucarioxylon) pseudoj>arenchym.atosum Gothan. 



A species from Tertiary or possibly Upper Cretaceous rocks 

 in Seymour Island (S. lat. 64° 16y 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 /x in diameter; the 

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

 are several small obhque pits in the field. Cross-bars^ (Miiller's 

 'querbalken') like those described in Araucaria hrasiliensis occur 

 in some of the tracheids. 



Dadoxylon Doeringii Conwentz^ 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*, recorded from 

 several localities in the Libyan desert; Dadoxylon Robertianum 

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

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

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

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

 Xenoxylon and regarded as identical with X. latiporosum'' . 



II. CUPRESSINOXYLON. Goeppert. 



The name Cupressinoxylon^ or, as written by Kraus, Cupresso- 

 xylon^, is usually applied to fossil wood exhibiting the following 

 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, PI. i. figs. 12—16. 



2 See page 135. a Conwentz (86) p. 16. 

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



= Sohenk (822). „ p^jj^ ^g^^^ p gjg_ 



' Gothan (10) p. 23. » Goeppert (50) p. 196. 



" Kraus in Schimper (72) A, p. 374. 



