294 



LOWER EOCENE FLORAS OF SOUTUEASTERN NORTH AMERICA. 



havo a different martjin from that species. 

 jVmong inodeni forms they are very similar to 

 several species of the genus Tetracera Linne, 

 which fact has suggested the specific name. 

 Several species of Tetracera, for exampk^ T. 

 arhorescens Jack of Sumatra and T. senegalensls 

 De Candolle of West Africa, are strand phints. 



Occurrence. — Grenada formation, Grenada, 

 Grenada Comity, Miss, (collected by E. N. 

 Lowe and E. W. Berry). Lagrange fonnation 

 (in beds of Wilcox age), Pmyear, Henry 

 County, Term, (collected by E. W. Berry). 



Collections. — U. S. National Museum. 



DlLLENITES TEXENSIS Beri'V, U. sp. 

 Plate LXVIII, figure 5. 



Description. — Leaves medium sized, l)roadly 

 oblong-lanceolate and slightly inequilateral in 

 general outline. Length about 9.5 centi- 

 meters. Maximmn width, m the middle 

 part, about 3. .3 centimeters. Apex sharply 

 pointed. Base pointed, incurved, and decur- 

 rent. Margins feebly straight-sen-ate; teeth 

 distinct, one to each secondary, or less in num- 

 ber than the secondaries. Texture subcoria- 

 ceous. Petiole not preserved. Midrib rather 

 stout, promment on the lower surface of the 

 leaf. Secondaries relatively stout and prom- 

 inent; at least 1.5 pairs diverge from the midrib 

 at close but somewhat irregular mtervals at 

 angles of about .50°; then course is relatively 

 straight except m the marginal region, where 

 they ciuTe upward somewhat and are cras- 

 pedodrome. Tertiaries thui and largely im- 

 mersed m the leaf substance; a few percurrent 

 and lateral veins are visible, apparently form- 

 ing open obsolete meshes. 



This species, which is founded on very im- 

 perfect material collected from the sandy lam- 

 inated clays of the Wilcox group along Colorado 

 River in Texas and from a single specimen from 

 the Grenada formation of Grenada, Miss., ap- 

 pears to be clos(>ly allied to the contemporane- 

 ous forms which are referred to the new genus 

 DiUenites. It lacks the ovate outlme and more 

 numerous teeth of DiUenites ovatus Berry and 

 the close-set teeth of the two smaU-leafcnl 

 species DiUenites tetracerafolia Berry and Dil- 

 lenites serratus Berry. Though less robust and 

 much smaller it reseml)l(!S DiUenites microden- 

 tatus (HoUick) Berry in the characters of the 

 margin and in venation but differe somewhat 

 in general outline. 



Like the associated smaller-leafed species of 

 DiUenites, it shows great smiilarity to existrng 

 tropical American forms of the genus Tetracera 

 Linne (Rhinium Schreber, Euryandra Forster, 

 Walilbomia Thmibcrg). The slightly inequi- 

 lateral outline suggests comparisons with the 

 leaflets of compound leaves, for exam])le those 

 of Fraxmus or Rhus, and such comparisons 

 have been niade without success. Similar 

 leaves, generally from younger horizons, have 

 often been referred to the genus Planera, but 

 many of these references are not conclusive. 



Occurrence. — Wilcox group, 1 ,000 yards below 

 Fopo Bend on Colorado River, Bastrop Comity, 

 Tex. (collected by Alexander Deussen). Gren- 

 ada formation, Grenada, Grenada County, 

 Miss, (collected by E. N. Lowe and E. W. 

 Berry). 



Collections. — U. S. National Museum. 



Family TERNSTRCEMIACEffi (THEACEffi). 

 Genus TERNSTRCEMITES Berry, n. gen. 



This genus is proposed for leaves resemlilmg 

 those of Gordonia, Hwmocharis, Pyrenaria, 

 Freziera, Eurya, and the like, of the family 

 TernstroemiaceiB, probably representing an 

 ancestral Eocene fonii of more than one exist- 

 ing genus. For the present its characters are 

 those of the following species: 



Leaves with acuminate apex and base, margin finely 



dentate-serrate Ternstroemites eoligniticus. 



Base broadly rounded, slightly deeurrent, margin rather 



coarsely crenate Tenutra: miles prechiihornensis . 



Apex bluntly poiated, base much deeurrent , margin finely 



crenate Ternstrct mites omtiis. 



Leaves linear-lanceolate, falcate, margin shows distant 



shallow crenations Ternslronniles lanceolalus. 



Ternstrcemites eoligniticus Berry, n. sp. 



Plates LXXVI, figures 1 and 2, and LXXVIII, figure 5. 



Description. — ^Leaves as a rule relatively 

 large, oblong-lanceolate in general outline, the 

 tip iiarrow(>d and extended acvmiinate and the 

 base sharply cuneate. Length ranges from 11 

 to 18 centimeters. Maximum width, at a 

 point about midway between the apex and 

 the base, ranges from 1.5 to 3.25 centi- 

 meters. Margins entire at the base, above 

 which close-set dentate teeth gradate, upward 

 into serrate teeth, the margins in tiieu- entnety 

 being irregularly more or less undulate. Tex- 

 ture coriaceous. Petiole not preserved. Mid- 

 rib very stout, prominent on the lower sui-face 



