OF LOWER GBEEN8AND PLANTS. 89 



only vertically running resin-canals, is confined to that genus, 

 and is a character of great importance. There are, however, 

 many points of difference between our fossil and Gothau's, as 

 Avill be seen in the diagnoses and descriptions. Gothan's form 

 h.-is very large canals, in ours they are particularly small; 

 Gothau's wood has traumatic horizontally running canals, while 

 our specimen has none ; his canals, normally, are few in number, 

 ours occur, often in numbers together, in every growth-ring, 

 always in the autumn wood ; and, finally, our canals, so compact 

 aud small, and with such a definite small number of epi- 

 thelium-cells, are very characteristic. 



The position of the single canals and of the rows of resin- 

 canals, which are constantly in the middle of the thick-walled 

 zone of autumn wood, is of interest and possibly of specific value. 

 As Jeffrey (1905, p. 16) noted, even the traumatic resin of 

 Cedrus shows a constant difference in the position of the 

 canals in allied species, those in C. deodara occurring in the 

 autumn wood and those in 0. atlantica in the spring wood. 



Beyond Gothan's species, comparison is uncertain. KrSiusel 

 ( 1 913) re-describes a Tertiary wood (first described by Goeppert) 

 as belonging to this genus, but unfortunately he gives no figures, 

 and from merely verbal description it is almost impossible to 

 gain convincing impressions of some of the salient details. 



The fossil described by Knowlton (1900) as a new genus, 

 Phioxylon, and associated bj 7 him definitely with Pinus, is con- 

 sidered by Gothan to belong to this genus, but Knowlton's 

 illustrations are so unsatisfactory that no detailed comparison 

 with our new species can be attempted. 



The foliage and fructification borne by this genus are as yet 

 unknown. 



V. 4859. Type-specimen. A part of a petrified branch 4 cm. 

 long, with some small pieces of the same, from which 

 sections have been cut. The centre of the axis is 

 petrified, and a number of well-marked annual rings 

 make up a total diameter of about 4'5 cm., which, 

 being decorticated, is probably much less than the true 

 diameter of the branch. The exterior of the fossil 

 shows decorticated wood-texture, partly covered by the 

 coarse granular matrix. One end of the trunk is 



