CONTRIBUTIONS FROM THE PHANEROGAMIC LABORATORIES 

 OF HARVARD UNIVERSITY. NO. 57. 



THE HISTORY, COISIPARATIVE ANATOMY AND EVOLU- 

 TION OF THE ARAUCARIOXYLON TYPE. 



By Edward C Jeffrey. 



Part III. 



The present article will be devoted to the consideration of resin 

 canals in the wood of the Araucariineae, living and extinct. Some 

 time ago the present writer in collaboration with Dr. Arthur Hollick ^^ 

 described the occurrence of resin canals as a result of injury in certain 

 Araucarian woods from the Raritan Cretaceous of Kreischerville, 

 Staten Island. Later a more complete study of this phenomenon was 

 made, which included the consideration of more varied and abundant 

 material from the Kreischer\ille deposits, as well as from the strata 

 of similar age on the island of Martha's Vineyard and likewise from 

 the much older Cretaceous Potomac deposits of Virginia. In this con- 

 nection certain leafy twigs of Cretaceous Conifers were described in 

 which the wood clearly showed the formation of resin canals as the 

 result of injury. The twigs in question belonged to the well known 

 Cretaceous genus Brach^'phyllum, and for that reason the Araucarian 

 type of wood, producing traumatic resin canals as a result of injury 

 was named Brachyo.\ylon.^° Still another type of Araucarian wood, 

 forming traumatic resin canals was described by the present writer 

 in 1907.^^ Here the canals were much more like the traumatic resin- 

 canals of the Abietineae than has proved to be the case with any other 

 araucarian woods, showing wound resin canals from the American 



29 Cretaceous Coniferous Remains from Kreischerville, Mem. N. Y. Botanic 

 Garden, No. III. 



30 Jeffrey, E. C, Wound Reactions of Brachyphyllum, Ann. Botany, 20, 

 pp. 3.s:}-:394, pis. 27, 28. 



Hollick and Jeffrey, Cretaceous Coniferous Remains from Kreischerville, 

 Mem. N. Y. Bot. Garden, No. III. 



31 Araucariopitys, a new genus of Araucarians, Bot. Gazette, 44, pp. 435-444. 



