PARIETALES. 



293 



and elongated distad, markedly inequilateral 

 especially proximad, with tiie typically double 

 serrate margin of this genus. Tlie secondaries 

 are more numerous and nuich less curved and 

 the tertiaries are percurrent or forked. The 

 species now under discussion is clearly imallied 

 to Ulmus, which, as a rule, is very inecjuilateral, 

 or to Carpinus or to the species of Juglandacea?, 

 Celastracea^ Rhamnacea?, vSapindacea?, and the 

 like, with which it hsis been compared. It ap- 

 pears to be alUed with the gi'oup of forms which 

 I have constituted as tlie genus Dillenites of the 

 DiUeniacea;. Among these forms it is clearly 

 distinct by rciison of the broadly rounded base 

 and much-curved ascending secondaries. In the 

 known Wilcox flora the only species at all simi- 

 lar to it is Juglans tiafi'ordiana Lesc[uereux. In 

 addition to the type material a single leaf of this 

 species was discovered in splitting up some 

 apparently wortliless specimens of clay iron- 

 stone collected by Hilgard many years ago. 



Occurrence. — Wilcox group, one-fourth mile 

 above Coushatta, Red River Parish, La. (col- 

 lected by G. D. Harris). Ackerman formation, 

 Hurleys, Benton County (formerly part of Ti)i- 

 pah County), Miss, (collected by E. W. Hilgard, 

 E. N. Lowe, and E. W. Ben-y). 



Collections. — U. S. National Museum; New 

 York Botanical Garden. 



Dillenites serratits Berry, n. sp. 

 Plate LXXV, figure 6. 



Description. — Leaves small, ovate-lanceolate 

 in general outline, the tip gradually narrowed 

 and acuminate and the base acuminate and de- 

 current. Length about 6 or 7 centimeters. 

 Maxinmm width at or below the middle of the 

 leaf about 2.3 centimeters. Margins entire 

 below for a distance of about 1 centimeter. 

 Above the entire portion they show small close- 

 set, upwardly directed, acuminate-serrate teeth. 

 Texture coriaceous. Petiole medium sized, not 

 preserved for its full length. Midril) of niedium 

 size. Secondaries thin but prominent, some- 

 what unequally spaced, subparaUel; about 12 

 subopposite to alternate ])airs (hvcrge from the 

 midrib at angles of al)out 45° and pursue a 

 rather straight craspedodrome course. Ter- 

 tiaries thin, comprising ])ercurreiit no-viUes 

 and one or two craspedodrome branches from 

 the upper outer sides of the secondaries. 



This species is nuich smaller than Dillenites 

 microdentatus (llollick) Berry, from which it 



also differs in its less regular secondaries and 

 close-set marginal teeth. It is more robust 

 tliau Dillinites tetracerafolia Beny, from vvhicli 

 it differs also in tlie character of the marginal 

 teeth, in general outline, and to a less degi'ee in 

 venation. Like that s])ecies, Dillenites senvfus 

 is very similai- to certain existing species of 

 Tetracera Linne, a cosmopolitan tropical genus. 

 Dillenites serratus is not es])eciaDy close to any 

 described fossil forms, although certam leaves 

 ascril)(Hl to the Celastracea; and Uicaccffi resem- 

 ble it in outhnc; but differ markedly in venation. 

 For example, Cekistrus persei Ettingshausen,' 

 from Sagor in Carniola is identical in size, out- 

 line, and marginal character, but has a very 

 differinit venation. There is also a superficial 

 reseml)lancc between these leaves and various 

 fossil and li^-ing species of Ulmacese. 



Occurrence. — HoUy Springs sand, HoUy 

 Springs, Marshall County, Miss, (collected by 

 E. W. Berry). 



Collection. — U. S. National Museum. 



Dillenites tetracerafolia Berry, n. sp. 

 Plate LXXV, figures 4 and 5. 



Description. — Leaves small, ovate-lanceolate 

 and falcate in outline, the apex and base grad- 

 ually narrowed and acuminate and the base 

 decurrent. Length aliout 3. .5 to 4 centimeters. 

 Maximmn width, in the middle part of the leaf, 

 about 1.2 centimeters. Margins entire proxi- 

 mad. jUong their chstal two-thu'ds they cany 

 apparently broad shallow crenate teeth, which 

 are really incumbent serrate; the apex of each 

 is small, sharply pouited, and distally directed. 

 Textm-e coriaceous. Petiole short and stout, 

 about 6 millimeters in length. Midrib stout, 

 curved, broad but not prominent. Secondaries 

 immersed in the leaf substance and only seen 

 with magnification, thin, divergmg from the 

 midrib at wide angles, one running to each mar- 

 ginal tooth. Tertiaries obsolete. 



These small, commonly more or less inequi- 

 lateral, falcate leaves are characteristic, 

 although superficially they suggest some of the 

 WUcox species of Ternstroemites as well as cer- 

 tain described species of Celastrus from the 

 European Tertiary. They are not especially 

 close to the large Wilcox species Dillenites 

 microdentatus (llollick) and are smaller and 

 more fsdcate than Dillenites serratus Berry and 



lEttingshausen, C. von, Die fossUen Flora von Sagor in Krain, Theil 

 2, p. 31, pi. 10, tig. 1, 1S77. 



