124 THE FLORA OF THE DAKOTA GBUUP. 



comparatively narrower ; secondaries parallel and all ramose ; none simple 

 and basilar; teeth sharply pointed, distinct, mostly equal; surface of the 

 leaves smooth. 



It is probalily a variety of V. Lesquereirxii, but it has a peculiar 

 aspect, being equally and distinctly dentate, with secondaries parallel, all 

 ramose, the nervilles more distinct. All these forms and miuiy others were 

 found at the same localities; none, however, are identical or were found at 

 the same place with the leaves described as Betulites. 



ViBURNITES CRASSUS, Sp. DOV.l 



PI. XLV, Figs. 1, 2, 3, 4. 



Leaves very thick, coriaceous, round in outline, subcordate or sub- 

 truncate and entire at base, denticulate above, triplinerved; nerves thick; 

 lateral primaries open, branching outside with one, rarely two, pairs of lower 

 basilar simple veinlets which are thin and at right angles; secondaries, four 

 to five pairs, equidistant and parallel, craspedodrome with their divisions; 

 angle of divergence 45'^ to 50°. 



These leaves vary in size from 6"° to 10"™ in both vertical and trans- 

 vei'se directions. The borders are denticulate, more distinct, and with more 

 distant teeth, but the kind of border di^^siou or dentation is of the same 

 character, the small teeth being at right angles to the borders, as formed by 

 the more or less strong projection of the nerves and of their branches, and 

 separated by shallow sinuses. The texture of the leaves is thick and the 

 areolation coarse and deeply marked, especially in Fig. 4, a fragment which 

 may perhajis represent a different species, its areolation being evidently in 

 smaller meshes than in the two other leaves. Fig. 3 has only one basilar 

 veinlet on one side, Avhile Fig. 4 has the lateral primaries emerging from the 

 base of the lower secondaries and a pair of basilar veinlets. This difference, 

 as well as the nearly entire borders of the leaf, renders its reference to this 

 species somewhat uncertain. 



Habitat: Ten miles northeast of Delphos, Kansas. Nos. 4163, 4167, 

 4168 of the collection of Mr. R. D. Lacoe. No. 839, Fig. 4, of the nmseum 

 of the University of Kansas. Collected by E. P. West. 



' This species was first entered in the manuscript and described under the name of Protophyllum 

 traeaum by Prof. Lesquereux, but in pencil the name was changed to Phyliites. In a still later note 

 he said: " Omit Protophyllum crassum of PI. XLV, which is a Viburuites. I'rotophiilliiin crassum true is 

 a new species described from Lacoe's specimen, No. 1171." 



Protophyllum crassum "true" is figured from Lacoe's specimen, No. 1171, on PI. LXXVII, Fig. 4, 

 and also described from the uauuacript description of the specimens furnished Mr. Lacoe by Prof. 

 Lesquereux. — F. H. K. 



