LANCE FLORA OF EASTERN WYOMING 153 



Cissus? lobato-crenata Lesquereux 



(Plate 16, Fig. 3) 



Cissus hbalo-crenaUi Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 240, pl. 41, figs. 1-3, 1878. Knowlton, 

 U. S Geol. Surv. Prof. Paper 155, 114, pl. 49, figs. 3, 4, 1930. Dorf, Bull. Geol. Soe. Amer., vol. 51, 218, 

 222, 225, 1940. 



There are 3 specimens, of which the best is figured, which are referable to this species. Its 

 original description by Lesquereux was as follows: 



"Leaves subcoriaceous, subcordate at the base, broadly enlarged above it, rapidly narrowed 

 to an obtuse point, crenate and short-lobed all around, three-nerved from the base; primary and 

 secondary nerves branching, all tlie divisions craspedodrome." 



As is shown in the figured specimen, the Lance Creek specimens differ from the original 

 description, and from the type specimens, only in their wedge-shaped rather than subcordate 

 bases. In view of the variations expected and observed in the leaves of living species, this shght 

 difference is not considered sufficient for specific distinction. The general shape, the venation, 

 and the obtusely lobed crenate margins are here regarded as the usable diagnostic features of 

 the leaves of this species. 



In addition to its occurrence in the type Lance formation, this species has previously been 

 recorded in the Black Buttes, lower Dawson, and Middle Park floras. There is also an excellent 

 unreported specimen of it in the Laramie collection at the U. S. National Museum.^ 



I have not been able to find any leaves of living species of either Cissus or any other genus 

 which bear a close resemblance to those of Cissus? lobato-crenata. 



Occurrence — Locality P3855. 



Collection--\J. C. Mus. Pal., Plesiotype No. 2558. 



Ficus? ceratops Knowlton 



Ficus ceratops Knowlton, Bull. Torrey Bot. Club, vol. 38, 389, figs. 1-1, 1911. Berry, Canada Geol. Surv. 



Mem. 182, 28, 1935. Brown, U. S. Geol. Surv. Prof. Paper 189, 248, pl. 61, figs. 1-14, 1939. Dorf, BuU. 



Geol. Soc. Amer., vol. 51, 218, 222, 225, 1940. 

 Palmocarpon n. sp., Knowlton, Bull. Geol. Soc. Amer., vol. 8, 136, 1897. 

 Ficus russelli Knowlton, Bull. Torrey Bot. Club, vol. 38, 392, 1911. 

 Ficus sp., Knowlton, Proc. Washington Acad. Sci., vol. 11, 207, 1909. 



I was not successful in obtaining specimens of these fruits in the Lance Creek area. Knowl- 

 ton, however, made a considerable collection of them from this same region and from the true 

 Lance (Hell Creek formation) of eastern Montana. He at first regarded these as the seeds of a 

 palm, but subsequently compared them to the fruits of Ficus. I have examined KnowIton's 

 specimens in the collections at the U. S. National Museum, but can offer no further suggestions 

 as to their botanical affinities. Brown has recently made a large collection of these figlike casts 

 from the Hell Creek formation of Montana. He suggests that they may be the underground 

 tubers of Equisetum. This is a tenable view, but is not fully supported by the appearance and 

 character of true attached Equisetum tubers in tlie Lance Creek flora (plate 6, fig. 3) ; these differ 

 considerably from the specimens of Ficusl ceratops in shape and surface markings. 



To my knowledge, the only occurrence of this species outside the Lance formation of Wyo- 

 ming and Montana is in the Whitemud formation of Saskatchewan, as reported by Berry. 



Occurrence — U. S. Geol. Survey, "Ceralops beds, Lance Creek, Converse County, Wyoming. 

 CoIIected by J. B. Hatcher, June 188L" 



Collection — U. S. National Museum, No. 40258. 



Ficus? trinervis Knowlton 



(Plate 16, Figs. 4, 6) 



Ficus trinervis Knowlton, U. S. Geol. Surv. Bull. 163, 42, 1900. Cockerell, BuII. Amer. Mus. Nat. Hist., vol. 

 24, 89, 1908. Knowlton, Proc. Washington Aead. Sci., vol. 11, 197, 1909. Dorf, Carnegie Inst. Wash. 

 Pub. No. 508, pt. I, 56, pl. 6, figs. 1, 4, 1938; Bull. Geol. Soe. Amer., vol. 51, 218, 222, 225, 1940. 



• Specimen No. 4367, with specimen of Rhamnus clebumi. 



