Section IV., 1909. [ 77 ] Trans. R. S. C. 



"VII. — Revision of the Flora of the Little River Group No. 11. 



Description of the type of Dadoxylon Ouangondianum, Dawson. 



By G. F. Matthew, LL.D., F.R.S.C. 



(Read May 26, 1909.) 



In pursuance of the plan undertaken a year or two ago to revise and 

 catalogue the material returned to the Natural History Society of New 

 Brunswick and to the author, by Sir Wm. Dawson after his study of the 

 plants of the Dadoxylon Sandstone and the Cordaite shales of the Little 

 River Group, I Iiave taken in hand a few of the forms, with interesting 

 results. Perhaps the most interesting of these, on account of its ad- 

 vanced structure and as having been chosen to give a name to the group 

 of sandstones in which it is imbedded, is Sir William Dawson's Dado- 

 doxylon Ouangondianum. 



The writer has not attempted to study the intimate structure of this 

 species, which will be found well described and figured in Sir William's 

 memoirs on this flora, but only to describe the macroscopic characters of 

 one of the examples submitted to him. First, however, the present au- 

 thor will give Sir William's characterization of the species. 



Dadoxylon (Araucarites) Ouangondianum, ^ Dn., Plates I and II. 



Can. Nat.. Vol. VI, p. 165, figs. 1 to 4. 



Quart. Jour. Geol. Soc. 1862, p. 306. 



Foss. Plants Dev. and I'p. Sil. of Can., p. 12. 



Branching trunks with distinct zones of growth, and a pith of Stern- 

 hergia type. Wood cells very large with three to five rows of contiguous, 

 alternate, hexagonal aréoles with oval pores. Medullary rays with one 

 to three series of cells, and as many as 14 rows of cells superimposed on 

 each other. 



" In sandstones at St. John, where many large trunks occur. My 

 specimens are from the collection of Mr. Matthew and are described at 

 length and figured in the volume of the Canadian Naturalist cited 

 above." 



1 It is unfortunate that this cumbrous name and others of the same 3eriva- 

 tion, should have gone into geological literature, ouigudi (anum) would have ex- 

 pressed more correctly the sound of the " Indian " word from which it was derived. 



