102 CLADOPHLEBIS. 
the upper end are very similar to Schenk’s later figures of 
Pecopteris Browniana, pl. xxvi, figs. 8-5,’ and, in view of the 
more perfect nature of the English material, and the additional 
information it affords as to the character of the fern, I have 
regarded these specimens as portions of larger pinne of C. 
Dunkeri. The figure given by Geyler of Pecopteris exiliforme, 
from Japan, distinctly resembles C. Dunkeri, and does not suggest 
a plant with a well-marked specific difference. 
Fontaine’s examples of Aspidium Dunkeri undoubtedly belong to 
» that species, but the fertile pinnule, pl. xxii. fig. 9a, on which 
apparently the reference to Aspidium is based seems hardly suffi- 
cient evidence for assuming identity with the recent genus. I 
have included under C. Dunkeri some of the figures of Pecopteris 
Browniana given by Fontaine; probably more than those quoted in 
the above list of synonyms might be referred to Schimper’s species. 
This inclusion of some of Fontaine’s examples of P. Brownzana, as 
well as some of those referred by Schenk to the same species, is the 
result of the more perfect material recently acquired which proves 
the organic connection of different parts of fronds previously re- 
garded as distinct. Yokoyama, in describing his Japanese plant, 
adopts Phillips’ Jurassic species, P. exzlis,> for certain fern frag- 
ments which I am inclined to consider identical with C. Dunkeri ; 
the figure of P. obtusifolia, L. and H.,* which is included by 
Phillips under P. exilis, and the pinne of the latter species 
probably represent some other fern than that figured by Yokoyama. 
His specimens cannot well be separated from the present species. 
Nathorst compares his species, P. Geyleriana, from Japan, with 
P. exiliforme, Gey. (=P. exilis of Yokoyama); this, too, appears to 
me inseparable from C. Dunkeri. Cf. Nathorst, pl. iv. figs. 2—-6,° 
and Pl. VII. Fig. 3 of the present Catalogue. The fragment 
mentioned by Nathorst as Pecopteris, sp.,° is compared by him to 
P. exilis and P. Dunkeri. 
1 Paleeontographica, vol. xxiii. 
2 Potomac Flora. 
8 Geol. Yorks. p. 210, pl. viii. fig. 16. This species has recently been referred 
to a new genus, Klukia, Raciborski, Bot. Jahrb. vol. xiii. 1891, p. 4. 
4 Fossil Flora, vol. iii. pl. clviii. 
5 Denkschr. k. Ak. Wiss. math.-nat. Cl. vol. lvii. 1890. 
6 Ibid. pl. vi. fig. 4. 
