BERRY: LIRIODENDRON CELAKOVSKII VELEN. 479 
leaf is orbicular. Liriodendron Meekii is almost perfectly fiddle- 
shaped ; the apical lobes are not convergent; the lateral sinuses 
are in the basal half of the leaf, and are quite decided; the lateral 
lobes are basal and directed nearly laterally ; the secondaries are 
numerous, and the venation so far as known is that of Lirtodendron. 
Liriodendron Celakovskii is, on the other hand, a typically trilobed 
leaf with palmate venation, although the sinuses are shallow and 
the lobes not particularly well marked; the sinuses are in the 
apical half of the leaf and are directed downward, while the vena- 
tion is quite different from that of the former species, with few, and 
much curved secondaries. 
The genus Cissites which was originally proposed by Heer to 
include leaves presumably allied to Cissus, has been made to in- 
clude a variety of forms with more or less resemblance to Vitis, 
Platanus, Sassafras, Liriodendron, etc., by later authors. It is with 
Some of these that Velenovsky’s leaf shows a decided similarity. 
Lesquereux, in discussing his Cissites obtusilobus,* notes its 
tesemblance to Liriodendron Celakovskii, the venation being how- 
€ver strikingly different. 
A. Cissites which resembles this leaf is Cissttes salisburiacfolius, 
Ix. which} species has been referred successively to Populites and 
to Sassafras ; in fact it resembles some of the obtuse varieties of 
Sassafras cretaceum. “so called” very much. It is a somewhat 
larger leaf than Liriodendron Celakouskii and more decidedly tri- 
lobed ; in some of Lesquereux’s specimens which lack the decur- 
Tent base the venation is very similar to that of Lériodendron 
Celakovshit. 
Another species of Cissites which resembles this leaf is Les- 
quereux’s Cissites Harkerianus. The two leaves are exactly the 
Same size; the outline is the same, except for the slightly notched 
apex of Celakovskii and the somewhat decurrent base of Har- 
Rerianus. The venation is similar in the straight primaries and 
few greatly arched secondaries. ¢ 
Another species of analogous appearance is Hedera platanoidea 
Lx. His figure of this species (pl. 3,f. 5) resembles Liriodendron 
Lo ee 
* Fl. Dakota Group, 161. 
TAm. Jour. Sci. 46: 94. 1868. 
{See especially Cret. & Tert. Fl. St 3: 
