PROFESSOR HEER ON THE EOSSIL ELORA OE NORTH GREENLAND. 473 
In my 4 Flora Arctica’ I have unfortunately placed two species under this name. 
PL xiii. fig. 6 is correct, the other belongs, I believe, to Pterospermites , 
Leaf very large ; petiole strong, ribs much smaller, five midribs are nearly equally 
strong, a sixth is on the right side, and indicates an inequilateral leaf. Secondary 
nerves very distant ; areas divided by undulated nervules, enclosing a fine reticulation. 
It is very like Ficus tilicefolia, A.. Braun, but the secondary nerves are much shorter 
and more distant. 
XVII. Platane^e. 
44. Platccnus aceroides, Gcep. Hr. FI. Foss. Arct. p. Ill, pi. xlvii. fig. 3. 
Bemains of Platanus leaves are not rare at Atanekerdluk, and the collection contains 
several specimens ; none, however, are well preserved, and with many it is difficult to 
determine if they belong to this or to the following species. 
45. Platanus Guillelmce , Goep., Plates XLVII., XLVIII., XLIX., figs. 4 b, c , d. Foliis 
indivisis vel modo sublobatis, acute dentatis, in petiolum brevem attenuatis, nervis 
secundariis angulo acuto egredientibus. Goep. Tert. FI. von Schossnitz, p. 21, pi. xi. 
figs. 1, 2. Platanus (Eynhausiana , Goep. (ex parte), l. c. pi. x. fig. 4. P. aceroides 
var. Hr., FI. Tert. Helv. ii. p. 7, pi. lxxxviii. figs. 13, 14. FI. Arct. pi. xii. 
IJjararsusuk, pis. xlvii., xlviii. figs. 1, 2. Kudliset, pi. xlviii. figs. 3, 4. Atane- 
kerdluk. 
In my 4 Flora Arctica’ I have referred the genus Platanus to North Greenland. The 
leaf there represented (pi. xlvii. fig. 3) agrees in shape and toothing with P. aceroides. 
The plane leaves from Disco differ much from this ; they are tapered towards the petiole, 
slightly or not lobed, and have shorter teeth. The same leaf has been found at Schoss- 
nitz, and near the Schrotzburg. Gceppert mentioned it as P. Guillelmce. I have re- 
ferred it (Flora Tert. Helvet. ii. p. 71, and FI. Arct.) to P. aceroides, the living P. aceri - 
folia having similar leaves in its water shoots. As all the leaves from Disco, though 
differing in size and shape, belong exclusively to this form, it appears to me probable 
that it represents a different species, and one nearly allied to the American plane. For 
this species I have adopted Gceppert’s name of PI. Guillelmce, though his description 
does not quite agree (he says, 44 folium subquinquangulato-sublobatum”), though he 
has described another leaf, evidently belonging to this species (Schossnitz, pi. x. fig. 4), 
as PI. (Eninghausiana. Our plant chiefly differs from G(eppert’s in the larger teeth, and 
the secondary nerves diverging less from the primary. The Disco leaves present three 
different forms : — 
(1) A large, slightly 3-lobed leaf, with acutely divergent secondary nerves (Plate 
XLVII. fig. 1). 
(2) Scarcely lobed leaves with many smaller teeth (Plates XLVII. figs. 2, 3 ; XLVIII. 
1, 2, 4) ; pi. 1. fig. 3 a of my 4 Flora Arctica’ also belongs to this variety. 
(3) A leaf with a few large teeth (Plate XLVIII. fig. 3). The petiole is proportion- 
