DESCRIPTION OF SPECIES. 197 



size of the secondaries and their divisions w]ii?h enter them. Onlv the 

 branches of the basihir nerves, three pairs, descend into the pelta, curving- 

 along the entire borders, cainptodroine. The median nerve is stronger and 

 more marked in this s])ecies than in M. f/rai/dis Lesq., and the secondaries 

 less distant, more numerous (seven to eight pairs, besides the basilar ones), 

 and all branch in passing more or less obliqueh^ and slightly curved to the 

 liorders. The nervilles are distinctly seen in the ujjper part of the leaf and 

 are close, at right angles to the secondanes, flexuous, rarely branching. 



A marked relation of this leaf is whh M. grandis Lesq., from which it 

 differs by its smaller size, the more numerous secondaries, and the dentate 

 borders. 31. dcntafiis Heer^ appears still more closely related to this, but it 

 is a fragment of a larger leaf which seems to be partly lobate and partly 

 dentate. 



Habitat : Ellsworth County, Kansas. No. 785 of the museum of the 

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



MA(;clintockia cbetacea Heer. 

 PI. LIX, Fig. 4. 



Fl. Foss. Arct., vol. 6, Abtli. 2, p. 70, PI. xxsvi. Figs. 1, 2a; PI. xxxvil, Figs. 2-4. 



A fragment of a leaf which is elliptical, witli entire borders, five-nerved 

 from the base, nerves aerodrome, slightly diverging. 



The frag-ment is like those of the species as figured by Heer, especially 

 PI. XXXVII, Figs. 2-4 (loc. cit.), showing only the lower part of a leaf 

 4"°' long and 1.5"" broad. The leaf is elliptical, entire on the Ijorders, 

 five-nerved from the base; the median nerve broadest; the lateral, nearest 

 to the borders, are very thin; the texture is coi'iaceous, its areolation punctu- 

 late or reticulate. The second lateral nerve, between the midrili and the 

 marginal ones, has a few branches from near tlie base like that in Heer's 

 PI. xxxvii. Fig. 2 (loc. cit.), in which the marginal one is thin and more 

 proximate to the borders of the leaf 



By the irregular disposition of the nerves near the base, the fragment 

 has some likeness to TTakea arctica Heer (Fl. Foss. Arct., vol. 1, PI. xv. Fig. 

 5), the leaves of which are broadei' and shorter. 



The fragment from Kansas bears a line of parasites Avhich are oval, 

 acute at the lower part, concave, with a convex point in the middle; the}' 

 are placed along- the lateral nerves in a row of ten or more and by their 



«F1. Foss. Aret.,voI. 6, AbtU. 2, p. 92, PI. xxxviu, Fig. 4. 



