434 MESOZOIC FLORAS OF UNITED STATES. 



agree in all respects with those of the large type specimen, W. C, B., No. 

 1472. This agreement extends to the phyllotaxy. The specimen is 11 

 cm. wide (tangentially) , 10 cm. high (vertically), and 6 cm. thick (radiallj^). 

 (Locality: PL LXXX, No. 83.) 



Ctcadeoidea McGeeana Ward. 



PL LXXXVII, Figs. Ill, .3, 10; iv, 1.5; v, 8, 9, 19, 20; PL LXXXIX, Figs, n, 1, 8; 



m, 4, 9, 10; PL XCIV. 

 1897. Cycadeoidea McGeeana Ward: Proc. BioL Soc. Washington, VoL XI, p. 12. 



Trunks low and fiat, with ample diameter, sometimes three times 

 as thick as high, yellowish, brown, or nearly black, more or less porous 

 and spongy, and of low specific gravity; leaves and spadices set nearly 

 at right angles to the axis; leaf scars arranged somewhat definitely in 

 quincunx order and disposed in spiral rows around the trunk, small and 

 uniform in shape, subrhombic with the vertical angles obtuse, the lateral 

 ones acute, narrow-elongate, 6 cm. to 10 cm. in vertical by 16 mm. to 

 20 mm. in lateral dimensions, averaging 8 mm. by 20 mm., usualty empty 

 by the disappearance of the leaf bases, at least to a considerable depth; 

 ramentum walls thin, often less than 1 m.m., with or without evident 

 commissure, and with occasional punctations; axes of inflorescence few 

 and scattering, sometimes projecting and filled with the substance of the 

 spadix, sometimes cavitous from the decay of the essential organs, sur- 

 rounded by obtusely triangular or somewhat crescent-shaped bract scars; 

 armor 4 cm. to 5 cm. thick; liber and cambium sometimes distinguishable; 

 woody zone usually divided into two or three rings; medulla large, 

 porous. 



A very distinct species of low and squat trunks, some of them having 

 almost the form of a car wheel, only a very small part of which can be 

 due to vertical compression. The external organs, however, closely 

 resemble those of C. Tysoniana. It now embraces 13 specimens, ah 

 increase of 6 since 1897. They bear the numbers of the museum of the 

 Woman's College of Baltimore, except a few of the last ones, which were 

 obtained through the joint action of that college and the State Geological 

 Survey of Maryland. 



