MARYLAND GEOLOGICAL SURVEY 227 
tending to the denticulations. These leaves are named in honor of Dr. 
L. C. Glenn, in whose company they were collected. They are very 
closely allied to the living Q. wislizenit Engelm. 
Occurrence—SUNDERLAND ForMATION. Near the headwaters of Is- 
land Creek, Calvert County. 
Collections.—Maryland Geological Survey. 
QUERCUS PSEUDO-ALBA N. sp. 
Plate LXX, Fig. 2; Plate LXXI, Figs. 1-6. 
Description.—Leaves varying in size and outline, irregularly pinnati- 
fid into obtusely pointed lobes, the lower ones entire and extended into a 
wedge-shaped base, the upper ones occasionally sub-lobed (?) ; sinuses 
rounded; secondary nervation irregular, consisting of a series of main 
nerves extending from the midrib at varying angles to the extremities of 
lobes, with forks extending to the extremities of the sub-lobes (?) and 
an intermediate finer series extending with the tertiary nerves and finally 
forming sub-marginal nerves extending along the margins of the lobes. 
These leaves appear to be practically identical with many forms of 
the living Q. alba LL. and they might also be compared with forms of Q. 
macrocarpa Michx, and Q. lyrata Walt., all of which vary greatly in size 
and shape. @Q. garryana Dougl., Q. utahensis (A. D. C.) Rydb. and Q. 
gunnisoni (Torr.) Rydb. may also serve for comparison, but the imperfect 
condition of the Maryland specimens renders it impossible to determine 
accurately their nearest allies in the living flora, hence it has been 
thought best to merely indicate in the name adopted the general apparent 
relationship with the white oak group. 
Occurrence.—SuNDERLAND Formation. Point of Rocks and near the 
headwaters of Island Creek, Calvert County. 
Collections—Maryland Geological Survey. 
