KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:o 3. 23 
phylla Pom. but which is sterile and thus does not show the peculiar form of fructi- 
fication which is the generic distinction of Stachypteris. This speciraen might indeed 
be held to be specifically identical with the Patagonian form. SAPORTA'S illustration 
leaves very much to be desired, however, and his description does not agree very 
well with the Patagonian specimen, the rachises, for instance, being stated in the 
diagnosis to be cylindrical, yet there is no doubt that this frond of SAPORTA”S re- 
presents the closest known analogy to the Patagonian form. Of SAPORTA'S other speci- 
mens, the one in his pl. 50, fig. 3, which is fertile and with certainty belongs to 
Stachypteris, comes fairly near to the specimen of the upper portion of a frond shown 
in our pl. 2, fig. 3. The rest of his illustrations represent very different forms, with 
which the Patagonian fronds cannot be compared. It is very possible that the speci- 
mens figured by SAPORTA as Stachypteris lithophylla really belong to different species. 
According to his descriptions, the one in his pl. 50, fig. 4, which is mentioned above 
as most closely agreeing with the typical Patagonian specimens, should be regarded 
as the one most probably identical with PoMzEr”s (1849, p. 7) Stachypteris lithophylla, 
which was also sterile. Yet, in view of the difference between the Patagonian form 
and the majority of the specimens figured under the name of Stachypteris lithophylla, 
it appears to be better to keep the former, which is very constant and characteristic, 
as a separate species. 
The species is a common one in locality c, but occurs mostly in a very frag- 
mentary state. 
Asplenites lanceolatus n. sp. 
PlTeEfest k. 
Under the quite provisional generic name ÄÅsplenites are described here some 
fern-pinnules which cannot be referred to any of the usual form-genera and which 
are too fragmentary to warrant the institution of a new genus. 
Frond pinnate? Pinnules shortly but distinctly stalked, lanceolate, with rapidly 
tapering or somewhat rounded bases and acute apices. Edges strongly but irregul- 
arly dentate. Midrib strong, persisting to the apex; secondary veins dense, arched, 
once or twice bifurcating. 
It is probable that the present specimens represent pinnules of a pinnate frond, 
though this cannot be actually proved. The most important character is the shape 
of the base and the occurrence of a short but distinct petiole. These features, in 
connection with the Cladophlebis-like venation, make it impossible to refer the speci- 
mens to any definite form-genus, but place them rather apart from all known 
Mesozoic ferns. 
There have been described a couple of Mesozoic ferns which have somewhat 
similar tapering or rounded bases and short petioles, but none of them can be very 
elosely compared with the present fragments. One of these forms is the genus Ungeria 
SALFELD (1908, p. 385), which was instituted on the poorest possible material. It is 
not even certain that the only specimen known is a fern: were it not that it is 
EK. Sv. Vet. Akad. Handl. Band 51. N:o 3. ? 
