THE FLOKA. 



117 



delicate intermediate nerve between the prin- 

 cipal ones. 



The material upon which this form is based 

 is in reality hardly sufficient for the proper 

 characterization of a new species, but as it 

 appears to differ from all other Laramie species 

 already described it must receive a name. It 

 is based on fragments of leaves 7 or 8 centi- 

 meters long and from 1 to 1.5 centimeters 

 wide. They are marked by numerous parallel 

 veins about 5 millimeters apart, with slender 

 intermediate veins, one between every two of 

 the stronger ones. It is named in honor of 

 Mr. R.'C. Hills, of Denver, Colo. 



Occurrence: Laramie formation, Erie and 

 Coal Creek, Colo. 



Cyperacites? tessellatus Knowlton, n. sp. 



Plate III, figures 1, 2. 



Cyperacitesf lessellaHis Knowlton [nomen nudum], U. S. 

 Geol. Survey Bull. 696, p. 222, W19. 



In the material from Popes Bluff, the locality 

 earlier known as the Healey coal mine, there 

 are several fragments of a large monocoty- 

 ledonous leaf that is very strongly marked. 

 Neither the length nor the width can be ascer- 

 tained, though there are fragments 8 centi- 

 meters long and 5 or 6 centimeters wide. It is 

 provided with strong, deeply impressed longi- 

 tudinal veins which are a little less than 1 

 millimeter apart and without intermediate 

 veins. It is, however, also provided with 

 cross veins, which are nearly as deeply im- 

 pressed as the others and cut the space between 

 the veins into very regular rectangular areas 

 about 1 millimeter long. This was evidently a 

 thick, firm leaf, as the veins and cross veins are 

 so deeply impressed. 



The proper generic^reference for this form is 

 uncertain. Superficially it resembles Zingi- 

 berites dubiu^ Lesquereux,'" from the Denver 

 formation, but it is excluded at once by the 

 fact that the latter species has six or seven very 

 thin veins between the strong veins. It also 

 resembles certain leaves that have been re- 

 ferred to Typha, such as Typha latissima Heer,^' 

 but it is twice the width of even the largest 

 leaves of that species and has three or four 

 intermediate veins between the larger ones. 

 The cross veins in Typha are very much like 



■' Lesquercux, Leo, U. S. Geol. Surv-ey Terr. Rept., vol. 7, p. 9j, pi. 

 in, rig. 1, 1878. 

 » Heer, Oswald, Flora tertiaria Helvetiae, vol. 1, pis. 43, 44, 1855. 



those in the present specimens, but none of the 

 nervation is deeply impressed. 



Occurrence: Laramie formation, Popes Bluff , 

 west of Pikeview, Colo. (sec. 14, T. 13 S., R. 67 

 W.), collected by A. C. Peale and M. I. Gold- 

 man, 1908. 



Cyperacites? sp. 



Plate IV, figure 1. 



Cyperacites? sp. Knowlton [nomen], U. S. Geol. Survey 

 Bull. 696, p. 223, 1919. 



The collections from Leyden Gulch contain a 

 number of specimens that are somewhat diffi- 

 cult of interpretation, though obviously they 

 are of monocotyledonous type. They appear 

 to represent the stems and leaves of some plant 

 resembling a sedge or possibly a grass. They 

 are from 8 to 10 millimeters wide and nearly 1 

 millimeter in thickness as now compressed; 

 what appear to be leaves of the same plant are 

 1.5 centimeters wide. They are provided with 

 numerous very iuie, close, parallel nerves, 

 about 8 or 10 to each millimeter. There is a 

 little evidence to show that some of the nerves 

 are slightly heavier than the others, but the 

 difference is not marked. There is also some 

 evidence of the presence of cross veins, but this 

 is very obscure. 



This form is of no particular importance bio- 

 logically and is described simply for the pur- 

 pose of showing that certain plants of this 

 general type were present at this time. 



Occurrence: Laramie formation, Leyden 

 Gulch, 6i miles north of Golden, Colo., collected 

 by A. C. Peale, 1908. 



Family GRAMINEAE. 

 Phragmites laramianus Cockerell. 



Phragmites laramianus Cockerell, Torreya, vol. 9, p. 141, 



1909. 

 Phragmites oeningensis Al. Braun. Lesquereux, Tertiary 



flora: U. S. Geol. Survey Terr. Kept., vol. 7, p. 8S. 



pi. 8, figs. 1, 2, 1878. 



The specimens figured by Lesquereux in the 

 "Tertiary flora" under the name Phragmites 

 oeningensis are preserved in the collections of 

 the United States National Musemn (Nos. 93, 

 94). They came from Golden, Colo., the 

 matrix on which they occur being the hard 

 white sandstone characteristic of the Laramie 

 at that locality. These specimens are before 

 me and appear to have been fairly well figured 

 and described. They are mere fragments. 



