392 Berry: MESOZOIC FLORA OF ATLANTIC COASTAL PLAIN 
Brachyphyllum macrocarpum formosum var. nov. 
Brachyphyllum macrocarpum Berry, Bull. Torrey Club 37: 183. 
1910; 38: 420. 1911. (Not Newberry, 1896.) 
DESCRIPTION: Slender elongated twigs, pinnately branched, 
covered with medium-sized, crowded, appressed leaves, spirally 
arranged. Leaves bluntly pointed, relatively smooth, thick. 
(PLATE 30.) 
In the consideration of the various specimens that have been 
referred to Brachyphyllum macrocarpum Newberry, a very con- 
siderable variation within certain fixed limits is at once obvious. 
This variation is usually one of size, the more slender specimens 
being at the same time more elongated and smoother. This has 
been frequently noted by the writer and is commented upon in 
print by Dr. F. H. Knowlton,* who in discussing the later forms 
(from Wyoming) suggests that the species on the verge of extinc- 
tion became smaller in its proportions. 
In studying the material from the South Atlantic and Gull 
States a constant difference in size was noticed by the writer. 
This may reflect a slight difference in climatic conditions, and 
all of the forms may be interpreted as the variations of a single 
species, in fact, one of Newberry’s figures{ of a Raritan specimen 
is approximately the same size as the forms from the Montana 
group of the West and is associated with the normal, stout, club- 
shaped type. That the variety has no particular stratigraphic 
significance is indicated by its abundance at a horizon as old * 
the basal Tuscaloosa formation in Alabama and its presence 
the Woodbine formation. In general, however, it occurs at later 
and more southern horizons than the type. This might be 
cribed to the fact that only the slender and more elongated ter 
minal twigs are preserved at these localities; but such an sgneit 
tion is regarded as improbable, since the same reasoning shoul 
hold good for the areas where only the thicker twigs have been 
found. 
The remains are usually much macerated and broken, 
is eminently true of the three specimens from Arthurs Bluff. 
See : the 
warrant for describing them as a new variety is furnished by T 
and this 
e 
* Knowlton, Bull. U. S. Geol. Surv. 163. 29. pl. 4. f. 5,6. 1909 ap 
+ Newberry, Mon. U. S. Geol. Surv. 26: 51. pl. 7. f. 1-7. 1896 pied 
