134 



LYCOPODIALES 



[CH. 



looked by Kidston who holds that the scars were produced by 

 sessile cones, is that in LepidodendronVeltheimianum strobili were 

 borne at the tips of slender branches ; the same difficulty is 

 presented by Bothrodendron (Fig. 213). It is unlikely that two 

 types of strobili were produced on the same plant, particularly 

 as the cone of L. Veltheimianum was heterosporous. 



The cones of certain species of Pinus remain attached to 

 the tree for many years and their bases become embedded in 

 the stem ; this is particularly well shown in the drawing of a 



Fio. 159. Pinus clausa. ^ nat. size. 



cone of Pinus clausa (fig. 159), for which I am indebted to 

 Mr Sudworth, Dendrologist in the United States Forest Service. 

 Mr Sudworth has drawn my attention to P. attenuata and P. 

 muricata in illustration of the same phenomenon^. The 

 example shown in fig. 159 cannot, however, be matched by any 

 known specimen of Ulodendron ; in the case of the depressions 

 on the stem of a Pine the cone-base fits the circular scar, 

 but in the fossil stems it is practically certain that this was 

 not the case. 



1 Garden and Forest, vol. v., pp. 160—162, fig. 2-4 (April 6, 1902). 



