202 ANATOMY OF THE GYMNOSPERMS 



10. C. acadianum, Dn. 



Transverse. The large tracheids are about 62x62 p. broad, the walls 9.5 p. 



thick. Scattering tracheids show resinous contents. 

 Radial. Ray cells often somewhat abruptly contracted at the ends, equal to 



2-4 tracheids; the lateral walls with numerous round or oval pits, 4-10 



per tracheid, chiefly about 6, the border often very narrow, the oblong 



orifice three fourths the diameter of the pit. Bordered pits numerous, 



hexagonal, 12.5-16 fj. broad, crowded in 2-5 rows. 

 Tangential. Rays very variable, ranging upwards of 60 cells high, resinous, 



more or less 2-seriate throughout, the oval or oblong cells 17-31 p. 



broad. 



Middle Coal Measures, Joggins, Nova Scotia; Port Hood, Mira, and Glace 

 Bay, Cape Breton ; Dorchester, New Brunswick ; St. George's Bay, 

 Newfoundland. 



11. C. ohioense, Dn. 



Trans-verse. Tracheids 47 x 56 p. broad, the walls 12.5 p, thick. 



Radial. Ray cells chiefly short, about equal to 2 tracheids, straight, or 

 somewhat abruptly contracted at the ends ; the pits on the lateral walls 

 oval, with a prominent border, apparently 2 per tracheid, but not 

 exactly determinable on account of extended decay. Bordered pits in 

 3-4 rows, sometimes 2 rows throughout the tracheid, hexagonal, about 

 12.5 p, broad. 



Tangential. Rays numerous, upwards of 25 cells high; broad, about 41 p., 

 conspicuously squarish, i- or often 2-seriate or 3-seriate in part. 



New Lisbon, Ohio. 



12. C. materiarium, Dn. 



Transverse. Tracheids 45 x 75 p. broad, the walls 7.8 p. thick. Scattering 

 tracheids show resinous matter. 



Radial. Ray cells straight, somewhat narrowed at the ends, equal to about 

 2-6 tracheids ; the pits on the lateral walls large, oval, round, or oblong, 

 narrowly or even obscurely bordered, 1-5, chiefly 1-2, per tracheid. 

 Bordered pits numerous throughout the tracheids, chiefly in 2, some- 

 times in 3-4, rows, hexagonal, or, when more distant, oval, about 12.5 p. 

 broad. 



Tangential. Rays i-seriate or 2-seriate in part, upwards of 40 cells high, the 

 oval or round cells 17-35 f broad. 



Holmes County, Ohio (Newberry) ; Upper Coal Measures of Malagash, 

 Pictou, Joggins, Belen, and Cambon, Nova Scotia ; St. George's Bay, New- 

 foundland ; Mirimichi, New Brunswick ; Glace Bay, Cape Breton ; Marion 

 County, Illinois. 



13. C. Halli, Dn. 



" Wood cells very large, with 5 rows of contiguous, alternate, hexagonal 

 areoles. Medullary rays frequent, and with as many as 30 rows of cells 

 superimposed " (Dawson). 



Middle Devonian of Ontario County, New York. 



