218 CONIFEEALES [CH. 



A Triassic species described by Wherry ^ as Brachyoxylon penn- 

 sylvanicum may, as that author suggested, belong to Cedroxyloni 

 the tracheids have 1 — 2 rows of pits, usually separate but sometimes 

 alternate and hexagonal as in Cedroxylon transiens and C. Hornet ; 

 no description is given of the medullary-ray pitting or of any 

 xylem-parenchyma. There are no adequate grounds for referring 

 this Triassic wood to Cedroxylon. Several species of wood from. 

 Triassic and higher horizons have been assigned to Cedroxylon, 

 but in many cases the descriptions fall short of modern standards 

 and accurate determination is impossible. Crie^ describes a 

 species, C. australe, from the Trias of New Caledonia though 

 his figures and descriptions do not afford satisfactory evidence 

 in support of this reference. Schenk^ mentions Cedroxylon 

 pertinax (Goepp.) as the oldest representative of the genus and 

 speaks of it as Rhaetic, while Gothan refers the species to a Juras- 

 sic horizon. A species founded by Goeppert and described by 

 Mercklin* from Jurassic rocks of Russia, Pinites jurassicus, may 

 be a Cedroxylon: the bordered pits are usually separate and 

 opposite but sometimes in contiguous groups. Mercklin states 

 that small thick-walled cells, often with dark contents, occur at 

 the outer limit of each ring. A specimen described by Felix^ as 

 Cormocedroxylon jurense from the Braun Jura of Galicia is com- 

 pared by him with Pinites jurensis. Fliche* records, though with- 

 out complete diagnoses, some French Lower Cretaceous species : 

 the tracheids of Cedroxylon reticulatum Sap., from the Albian of 

 L'Aube, are characterised by pits which are usually separate but 

 may be contiguous and flattened. Cones closely resembling those of 

 Cedrus occur in the same beds. This author gives partial descrip- 

 tions of C. barremianum Fliche'^ from the Lower Cretaceous of 

 Haute Marne and a Cenomanian species C. manekildense Fliche*, 

 but in neither case are the data adequate. 



C. matsumurae Stopes and Fujii^ is an Upper Cretaceous 

 Japanese species with 1 — 2 rows of tracheid-pits, generally opposite 



1 Wherry (12) PI. iv. 2 Crie (89) Pis. 11.— v. 



3 Schimper and Schenk (90) A. p. 871. 



* Mercklin (55) p. 48, PI. vm. figs, G— 10. ° Felix (82) p. 264. 



•' FUche (97) p. 7. ' Ibid. (00) PI. n. fig. 1. 



» Ibid. (96) PI. XV. fig. 3. 



9 Stopes and Fujii (10) p. 42, PI. i. fig. 10; PI. iv. figs. 20—23. 



