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. wislizenii 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 L. 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 Dough, Q. utaliensis (A. D. C.) Eydb. and Q. 

 gunnisoni (Torr.) Eydb. 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 Eocks and near the 

 headwaters of Island Creek, Calvert County. 



Collections. — Maryland Geological Survey. 



