174 



LOWER EOCENK ELOliAS OF SOUTHEASTERN NORTH AMERICA. 



in liirgf numbers. They may be compared 

 with the eone scales of the existmg genus 

 ^Vrthroti'.xis more satisfactorily than with any 

 other conifers. They (h> not on the other 

 hand offei- any satisfactory ])oints of contact 

 with the genera Glyptostro])U.s or Taxodium, 

 wliich are represented by fohage in the Wik^x 

 flora. In fact these cone scales, in the absence 

 of fi'uits of the foregoing genera, suggi'st that 

 possibly the foUage identihed as Glypto.strobus 

 may be that of Artlu'otaxis. 



Tlie modern species of Arthrotaxis are rehi- 

 tively small trees of mesophytic habitat, aUied 

 to Sequoia, but confined entirely to Tasmania. 



But few fossil species have been recognized. 

 Gardner ' describes fohage and cones from the 

 Ypresian of the Isle of Sheppey as Arthrotaxis 

 subulata. Tlie cones are slightly smaller but 

 comparable with the present species. Tlie 

 same author furnished good evidence - for con- 

 sidering certain remains from the Bartonian 

 and Ligurian of southern England which were 

 formerly referred to Sequoia couttsise Heer to be 

 more closely related to ^Vrthrotaxis. These 

 specimens also are similar to the Wilcox form. 



Occurrence. — Lagrange formation (in beds of 

 Wilcox age), Puryear, Henry County, Tenn. 

 (collected by E. W. Berry). 



Collection. — U. S. National Museum. 



Genus CUPRESSINOXYLON Goppert. 



CUPRESSINOXYLON CALLI KnowltoU. 



Plate XVI, figures 1-5. 



Cupressinorylon Calli. Knowlton, Geol. Sun-ey Ann. 

 Rept. Arkansas for 1889, vol. 2, p. 254, pi. 9, figs. 

 3-7, 1891. 



Description. — This species was based on col- 

 lections from a sihcified stem standing erect in 

 place in a bluish clay. The species shows a 

 distinct seasonal ring, 1 millimeter to 3.5 milli- 

 meters broad, marked by a series of reduced, 

 very much thickened tracheids, 6 to 1.5 or more 

 ill number. The traciieids show two or three 

 close rows of bordered pits on their radial walls, 

 0.012 millimeter in diameter. Medullary rays 

 numerous, separated by two to four rows of 

 tracheids, thin walled, uniseriate, and from 2 to 

 2.5 (average, 6 to 1.5) cells higli. Some of the 

 tracheids show pits on their lateral walls, of 



1 Gardner, J. S., British Eocene flora, vol. 2, p. 41, 1883; pi. 11, figs. 

 2-H. IS.K4. 



^Idem, p. 90, pi. I), fl(!s. 1-9; pi. 10, figs, c',-9; pi. 22, fig. 10; pi. 27, figs. 

 4, 4a, 18S4. 



which tliere are usually .3 in the tliickness of 

 each ti'acheid. R(>sin tubes consist of a chain 

 of short rectangular ceUs.^ 



This species is unquestionably from deposits 

 now referred to the Wilcox and is unique in 

 having l)een found erect at its place of growth. 



Occvrrence. — Wilcox group, 5^ miles north- 

 west of Gainesville, Greene Countv. Ark. (col- 

 lected by R. E. CaU). 



Collection. — U. S. Xatioiial Museum. 



Class ANGIOSPERMjE. 



Subclass MONOCOTYLEDONS. 



Order GRAMINALES. 



Family POACEffi. 



Genus POACITES Brongniart. 



POACITES Sp. HoUirk. 



Poacites sp. Ilollick, in II;irris, (i. D., and Veatch, A. C, 

 A ]>reliniinary report on the geology of Louisiana, 

 ].. 279, jil. 32, fig. 2, 1899. 



Description. — Indefinite fragmentary re- 

 mains of the foliage of some monocotyledon, 

 thought to be a grass by HoUick and described 

 as Poacites sp. He compared it with the Euro- 

 pean Tertiary species Poacites Ixvis Alexander 

 Braun and Poacites jirmus Heer. 



I have collected numerous similar fragmen- 

 tary specintens of foliage of grasses or sedges, 

 but none niore complete than HoUick's mate- 

 rial. I have decided that they are too indefinite 

 for specific description, and thus are of no 

 stratigrapliic value. I have therefore ignored 

 them entirely, except this and the following 

 so-called species, which are in the literature. 



Occurrence. — Wilcox group. Slaughter Pen 

 Blufl^ on Cross Bayou, Caddo Parish, La. 

 (coDected by G. D. Harris). 



Collection. — New York Botanical Garth'ii. 



Family CYPERACE.a;. 

 Genus CYPERITES Heer. 



Cyperites sp. HoUick. 



Cyperites sp. lloUick, in Harris, (i. D., and Veatch, 

 A. C, A preliminary report on the geology of Loui- 

 siana, p. 279, pi. 32, figs. 3, 4, 1899. 



Descnption. — Like llie preceding species this 

 is based on fragment.-; of monocotyl(Mlonous 

 folifige which are considered by HoUick to be 



' Description based on Knowlton's work. The specimens ot wood 

 collected durinK my study of the Wilco.x were not sectioned in time for 

 tlie results lo he included in thi.s volume. They will form the basis for 

 a subsequent special contribution. 



