C. J. Hylander — Mid-Devonian Callixylon. 321 



C. Newberryi (2). A form Ormoxylon (2) is given with, 

 three pit rows, as having very narrow wood rays one cell 

 thick, but this is more likely a typical Dadoxylon. 



Literature cited. 



1 Chamberlain, C. J. : Growth Eings in a Monocotyl, Bot. Gaz., 72, 293- 

 304. Text fig. 1-16, 1921. 



2 Dawsox, J. W. : Fossil Plants of the Devonian and Upper Silurian of 

 Canada, 92 pp., 20 pis., Geol. Snrv., Canada. Montreal, 1871. 



3 Elkixs, M. G., & Wieland, G. E. : Cordaitean Wood from the Indiana 

 Black Shale, this Journal, 38 : 65-78. pi. 1, 2, 1914. 



4 Goldring, W. : Annual Eings of Growth in Carboniferous Wood, Bot. 

 Gaz., 72, 326-330, 1921. 



5 Pexhallow, D. P. : Notes on the North American Species of Dadoxylon, 

 Trans. Eoy. Soc. Canada, 6, IV, 61, 1900. 



Wielaxd, G. E. : Flora Liasica de la Mixteca Alta, Inst. Geol. Mex., 

 Bol. 31, 1914. 



T Zalessky, M. D. : Etude sur 1 'anatomie du Dadoxylon Tchihatcheffi. 

 Goppert sp. Mem. du Comite Geol. Nouvelle Ser. Liv. 68, pp. 18-29, Pis. 

 I-IV, St. Petersburg, 1911. 



Osborn Botanical Laboratory, 

 Yale. University. 



