ARKIV FOR BOTANIK. 
BAND 10. N:o 15. 
On the Fructifications of Jurassic Fern-leaves 
of the Cladophlebis denticulata-type. 
By 
THORE G. HALLE. 
With 2 plates and 1 text-figure. 
Communicated April 26th 1911 by A. G. NATHORST and G. LAGERHEIM. 
While I was comparing some Antarctic and South Ameri- 
can forms of Cladophlebis with specimens from the Yorkshire 
coast in the collections of the Paleobotanical Department of the 
State Museum of Natural History in Stockholm, my attention 
was called by Prof. NATHORST to a specimen collected by him, 
in 1879, at Gristhorpe Bay and supposed to be a fertile leaf of 
Cladophlebis denticulata Bran. sp. Although only a small frag- 
ment, this specimen proved on a closer examination to be of con- 
siderable interest. It appeared to be identical with a fertile 
leaf figured by Sewarp and Forp (see below), and kept in the 
Sedgwick Museum at Cambridge, where it had been studied in 
1879 by Prof. NATHORST. On his request, this specimen was, 
through the courtesy of Professor Tm. M KENNY HUGHES and 
Mr. E. A. N. ARBER, lent to the Paleobotanical Museum of Stock- 
holm, where I have had an opportunity to compare it with the 
leaf first examined. The two specimens were found to agree in 
all essential features; but the Cambridge specimen was of great 
interest, as it shows the general shape more perfectly and also 
confirms the opinion arrived at, on the basis of the Stockholm 
specimen, concerning the structure of the sporangia. 
Although sterile fern-leaves of the Cladophlebis-type have 
a wide distribution in the Mesozoie rocks, but little is known 
Arkiv für botanik. Band 10. N:o 15. 1 
