JEFFREY: NEW ARAUCARIAX. 329 
disappears in the wood of the main axis at a comparatively short 
distance from the pith. In Uving Araucarian Conifers, as well as in 
allied fossil forms, a remarkable feature of structure is the persistence 
of the leaf-trace in the wood throughout the life of the axis. This 
feature has been referred to by Sir ^Yilliam Thiselton-Dyer ("Per- 
sistence of Leaf-Traces in Araucarieae," Ann. Bot., vol. 15, p. 547, 
1901). Professor Seward has also called attention to it in his recent 
monograph on the Araucarieae ("The Araucarieae, Recent and 
Extinct," Phil. Trans. Roy. Soc. London, ser. B, vol. 198, p. 305-411, 
pis. 23, 24, 1906) and considers it a primitive feature which the 
Araucarian Conifers have retained from the past. Professor Lignier 
likewise refers to the persistent Araucarian leaf-trace in the case of 
Mesozoic representatives of the group, in a recently published memoir. 
It appears very doubtful if Professor Seward's view of the primitive 
nature of the persistent leaf-trace of the Araucarineae can be main- 
tained, as it is not found in the case of the very ancient Araucarian 
genus at present under discussion. It is my intention to show in a 
subsequent article that the general condition of the leaf-trace in the 
older Araucarineae of the Mesozoic does not at all support the view 
put forward by Professor Seward, that the persistence of this structure 
in the secondary wood of certain modern representatives of the tribe 
is an inherited primitive feature. The opposite conclusion seems to 
be warranted by the facts, viz., that the persistence of the trace of the 
leaf in the secondary growth of the living genera is not a palingenetic 
feature, but one which has been more recently acquired. 
It is apparent from the description given above, that in the genus 
which is the subject of the present article, we have to do with a repre- 
sentative of the Coniferous stock, characterized by the wood structure 
of the modern Araucarineae, without the persistent leaf-trace which 
is characteristic of these, and with short-shoots, such as are found 
today clearly marked in the genus Pinus only. Since there is no 
indication of any but Araucarian characters in the wood we are justi- 
fied in including our genus with the general Araucarian stock. That 
it is an entirely new type of that stock is likewise apparent. For that 
reason it must be put in a new genus, which we propose to call in honor 
