XLIV] 



CEDROXYLON 



215 



Gothan makes no mention of Sanio's rims. The Abietineous 

 features predominate over the Araucarian, the latter being limited 

 to the local occurrence of polygonal and alternate bordered pits. 



W'VI B . 



FIG. 723. A, B, Cedroxylon transiens. C, Cedroxylon blevillense. (A, B, after 

 Gothan ; C, after Lignier. ) 



Wood of similar type was described by Schroeter 1 from King 

 Charles Land as Pinus (Larix) Johnseni: resin-canals, possibly 

 due to wounding, occur in the summer-wood. The medullary rays 

 are 1 18 cells deep and there are 1 3 simple circular pits in the 

 field ; all the walls of the ray cells are pitted. As in Cedroxylon 

 Iransiens the Araucarian type of pitting is represented on some of 

 the tracheids. 



Cedroxylon Hornei Seward and Bancroft. 



An Upper Jurassic species from Helmsdale 2 , Sutherland, a 

 locality from which Hugh Miller lecorded numerous specimens of 

 fossil wood which is still abundant on the beach immediately north 

 of Helmsdale. The annual rings are well defined: the bordered 

 pits are usually in a single row on the radial walls of the tracheids, 

 occasionally in contact and flattened; double rows of opposite 

 pits are not uncommon. Xylem-parenchyma is confined to the 

 late wood. Medullary rays, 1 26 cells deep, generally 8 12, 



1 Schroeter (80), PI. I. figs 18. 



2 Seward and Bancroft (13) p. 883, text-fig. 5; PL n. figs. 2225. 



