DESCEIPTION OF SPECIES— MAGNOLIACEiB. 249 



magnolia teniiinervis, Lesqz. 

 Plate XLIV, Figs. 5, 6; Plate XLV, Figs. 1-5. 



Magnolia tenuinervis, Lesqx., Annual Report, 1869, p. 196. 

 Magnolia InglefwJdit (Heer), Lesqx., Annual Eeport, 1872, p. 396. 



Leaves of large size, subcoriaceous, entire, broadly lanceolate, obtusely pointed, rounded to the 

 base; lateral nerves distant, brancliin;; irregularly, undulate iu passing to the borders, vphich tbey 

 closely follow in simple elongated bows. 



The midrib of these leaves is not as thick as in the former ; the substance 

 of the leaves is somewhat more solid, but not coriaceous; the lateral veins, 

 about on the same angle of divergence, are thick, more irregular in distance, 

 generally undulate, and branching sparingly and irregularly; the topis not 

 contracted, but rather obtusely cuneiform, and, as seen in pi. xlv, figs. 2 and 3, 

 the leaves are not enlarged above the middle, but rather oval-oblong, and 

 rounded to the base, as seen in fig. 3. As all the leaves found of this species 

 are fragmentary, I could not distinctly recognize their basilar outline. The 

 primary areolation, seen in figs. 1 and 3 of the same plate, is composed 

 of large, irregularly square or polygonal meshes, formed by subdivision.?, 

 either oblique or in right angle, of the nervilles, which are generally distinct; 

 the ultimate areolation is obsolete. I considered this species as perhaps 

 referable to AI. Iiiglefieldi, Heer, of the Arctic Flora, a species represented, 

 like ours, by numerous fragments. The characters of nervation are the same, 

 and the middle part of the leaf is also similar. But the Arctic species has 

 the leaves gradually narrowed to the base, and their substance is coriaceous, 

 the surface polished, etc., characters at variance with those of this one. Fig. 

 5 of pi. xlv seems different, and its reference seems at first unjustified; but, 

 comparing it with fig. 3, the identity is easily recognized, for the lateral veins 

 are not thicker, but merely deeply carved intoJ.he stone, as indicated by the 

 , shaded borders. The name of tenuinervis, given to this species from the first 

 specimen seen of it, is not quite app.-opriate, the veins being thin only on the 

 upper surface of the leaves, as in figs. 2, 3, and 4. 



Habitat. — Golden, Colorado, and Black Buttes, Wyoming; not rare. 

 The first specimen (fig. 4) was communicated by Dr. F. V. Hayden iu 1868 

 from Golden. 



magnolia Hiignrdiana, Lesqx. 



Plate XLIV, Fig. 4. 



Magnolia Hilgardiana, Lesqx., Trans. Am. Phil. Soc., vol. xiii, p. 421, pi. xx, fig. 1 ; Supplement to Annual 

 Report, 1871, p. 10.— Schp., Pal. V6g6t., iii, p. 74. 

 Leaves large, oblong-oval, rounded iu narrowing to the petiole; borders slightly undulate; mid- 

 rib comparatively narrow ; secondary nerves close, parallel, caraptodrome. 



The fragment figured is far from giving an idea of the fine leaves from 



