9 ARKIV FOR BOTANIK. BAND 10. w:o 16. 
about their affinities. It is generally understood that this genus 
includes forms which belong to very different families and only 
agree as to the outward characters of the sterile fronds. This 
is contirmed by the fact that different species with the Clado- 
phlebis-type of fronds have been referred to as different groups 
as, for instance, the Cyatheacee, the Schizeacee, the Osmundaceee 
and the Marattiacee. In the first of these families is generally 
placed the plant described by LINDLEY & HUTTON! as Neuro- 
pleris arguta and more recently attributed by SEwARD? to the 
genus Coniopteris. In this case the evidence is based on the 
shape of the fertile segments and the presence of a cup-shaped 
indusium. The structure of the sporangia is not known. 
In the aspect of the sterile fronds, a certain resemblance to 
the species just mentioned is shown by another mesozoic fern, 
first described as Pecopteris exilis PHILLIPS.? RACIBORSKI! has 
brought forward additional evidence to prove that this species, 
for which he instituted the genus Klukia, is a member of the 
Shizeacee, as had already been suggested by BuNBURY? on ac- 
count of the occurrence of an apical uniseriate annulus. 
In the Osmundacee have been placed several mesozoic ferns 
with the Cladophlebis-type of frond. The one best known is 
T'odites Williamsoni Bran. sp. The generic name Todites was 
first employed by SEWARD in preference to 7'odea, which had 
been previously used for this and other forms showing affinities 
to the recent fern T'odea barbara. In the case of Todites Willi- 
amsoni even the structure of the sporangia has been made known 
by ScHENK* and RACIBORSKI.” A few more Cladophlebis-forms 
have likewise been compared with Todea. So C. Roesserti, of 
which ZEILLER? has described fertile leaves resembling speci- 
mens of T'odites Williamson to a degree that would almost seem 
to suggest specifie identity. RENAULT? has examined fertile 
! The Fossil Flora of Great Britain, pl..105, 1834. 
> The Jurassic Flora, I, p. 115, 1900. 
* Illustrations of the Geology of Yorkshire. p. 148, 1829. 
* Über die Osmundaceen und Schizeaceen der Juraformation. Ewa- 
LER’S Botanische Jahrbücher, Bd. 13, H. 1, 1890. 
° On some Fossil Plants from the Jurassic Strata of the Yorkshire 
Coast. Quart. Journ. Geol. Soc. Vol. 7, 1851, p. 188. 
^ Die während der Reise des Grafen BELA SzÉcnÉNviI in China gesam- 
melten fossilen Pflanzen. Palxontographica Bd. 31. 1884, p. 6, pl. (IIL), 
figs. 3—3 b. 
Me, p, 4, pl. ay figs, y 10. : 
3 Flore fossile des gítes de charbon du Tonkin. Etudes des gites 
minéraux de la France. 1903, p. 38, pl. 2, figs. 1—7; pl. 3, figs. 1—3. 
? Cours de botanique fossile, 3, p. 81, pl. 11. 
