er 
L, Lesquereux on fossil plants from Nebraska. 97 
thick, attached to the leaf a little above the lower border, 
which is thus continuous. It is palmately seven-nerved, the 
nerves scarcely branching, diverging all around and vanishing 
before reaching the borders. The veinlets are perpendicular 
to the veins, slightly arched, subcontinuous ; ultimate reticu- 
lation polygonal, small, like that of a Ficus. But the relation 
with this genus is uncertain. 
25. Platanus aceroides ? Gipp., var. latior.— Leaf broader 
than long, palmately trilobate, with short scarcely distinct 
- lateral lobes ; borders distantly dentate, flat or undulate be- 
E 
2 
‘e 
a 
the former by its more narrowed base, the leaf descending to 
the petiole in a broad wedge-form. The primary and sec- 
form. The size of the leaves is equally variable. The only 
general character recognizable on all the specimens is the posi- 
tion of the point of union of the primary nerves, generally in 
, at a distance above the base of the leaves or the point of 
attach of the petiole. Except this, the nerves themselves 
er in their mode of branching, the medial one especially, 
Am. Jour. Sct.—Szconp Serres, VoL. XLVI No. 136.—Juxr, 1868. 
7 
