198 



LOWER EOCEXE FLORAS OF SOUTHEASTKRX NORTH AMERICA. 



and the two forms may iTproscnt distinct spe- 

 cies, tilthousjii they are identical except in size. 

 The venation is prominent. 



The present species is closely related to Ficus 

 planicostata Lescjuereu.x, as well as to the Wil- 

 cox species Ficus liarrisiana Hollick, which is 

 widest in the middle instead of at the base and 

 narrows both distad and proximad. The vena- 

 tion, though of the same general character, 

 shows weU-marked differences of detail. 



Occurrence. — Ackerman formation, Hm'leys, 

 Benton County (formerly part of Tippah 

 Count v), Miss, (collected by E. X. Lowe and 

 E. W.' Berry). 



Collection. — U. S. National Museum. 



Ficus denveriana Cockerell. 



Ficus speclabilu. Lesquereiix (now Kunth and Bouche, 



1847), U. S. Geol. and Geog. Survey Terr. Ann. 



Kept, for 1872, p. 379, 1873. 

 Lesquereux, The Tertiarj' flora, p. 109, pL 33, figs. 



4-6, 1878. 

 Lesquereux, U. S. Nat. Mus. Proc, vol. 11, p. 2.5, 1888. 

 Laurus utahensis. Lesquereux, U. S. Nat. Mus. Proc, 



voL 11, p. 24, 1888. 

 Ficus goldiana. Lesquereux, idem, p. 25 (specimen N(j. 



2471). 

 Ficus denveriarui. Cockerell, Torreya, vol. 10, p. 224, 1910. 



Description. — This species was descrilxni hy 

 Lesquereux from the Denver formation and 

 was based in the first instance on the large leaf 

 sho\vn in Plate XXXIII, figure 5, of "The Ter- 

 tiary flora." Subsequently l(>aves of aU sizes 

 and showmg a considerable range of variation 

 were referred to this species. It is present in 

 considerable abundance in the western half of 

 the Mississippi en^baynient area and may be re- 

 characterized as follows : Leaves ranging from 6 

 to L5 centimeters in length and from 2.25 to 8.5 

 centimeters in ina.ximum width, which is at 

 or more commonly below the middle; broadly 

 ovate in outline, with a somewhat extended 

 acuminate tip and a broadly rounded, slightly 

 decurrent base. Margins entire. Texture cori- 

 aceous. Midril) stout, prominent on tlie lower 

 surface of tlie leaf. Seconihiries of medium size, 

 numerous, opposite to alternate, close or some- 

 what remotely ])laced, generally snliparallel, di- 

 verging from tlie midrib at angles of aI)out 45°, 

 camptodrome in the marginal region. The 

 lower pair may be opposite and somewhat 

 stouter, with outside lateral camptodrome 

 branches, thus simulating a palmately tri- 

 veined leaf. This is true; in some of the Loui- 

 siana material as well as in some of the type 



material from the D(>nver formation. More 

 commoidy the secondaries are all sin^ilar and 

 subparaUel. 



Tiiis species makes its a])|)earan<'e in the 

 Midway ( '■) formation at Earle, Tex., as well as 

 in tiie basal Eocene of tlie Kocky Mountain 

 province (Raton formation). It continues 

 throughout the Wilcox group in Arkansas and 

 Louisiana and in beds of WUcox age in Ken- 

 tucky but has not been detected in the eastern 

 Gulf area. 



Occurrence. — Wilcox group, Scarboroughs, 

 Clay County, Ark. (collected by J. C. Branner), 

 Campbell's quarry, Cross Bayou, Caddo Parish, 

 La. ; McLees, 2 miles north of Mansfield, De Soto 

 Parish, La. (collected by L. C. Johnson) ; and 

 one-fourth of a mile above Coushatta, Ked 

 River Parish, La. (collected by E. W. Beny). 

 Lagrange formation (in beds of WUco.x age), 

 Wickliffe, Ballard Countv, Kv. (collected by 

 L.C. Glenn). 



Collections. — LT. S. Xational Museum. 



Ficus cinnamomoides Lescjuereux. 



Ficus cinnamomoidet:. Lesquereux, Am. Philos. Soc. 

 Trans., vol. 13, p. 417. pi. 17, fig. 8, 1869. 



Description. — Lesquereux in 1S()9 gave the 

 following description: 



F. foliis late ovatis, ba,si rotundatis, integerrimis, irregu- 

 lariter trinerviis; nervo medio arcuato, nervis secundariis 

 crassis, angulo acute? sinu obtuso egredientibus, subtus 

 raraosis. 



This species was foinided on a single incom- 

 plete specimen collected by Hilgard about 

 1860 and since lost. I have been unable to 

 correlate it with any of the forms in tlie large 

 collections from the Wilcox that have been 

 studied by me. 



Occurrence. — "Soft white clay, Lafayette 

 County, Miss." This means that it was from 

 the IloUy Spruigs sand at Oxford or the Acker- 

 man formation at Raglands Branch, southeast 

 of Oxford (collected by E. W. Hilgard). 



Collection. — Type lost : formerly at the State 

 Univei-sity, Oxford, Miss. 



Ficus neoplanicostata Knowlton. 



Plate CXIV, figure 1. 



Description. — This species was ideiitilicd for 

 me by F. H. Knowlton, who has fully described 

 it in his unpublished paper on the Raton Mesa 

 flora. 



