CLADOPHLEBIS. 95 
of fructification, and therefore the genus Cladophlebis has been 
retained. The comparison of these sterile fronds with those of 
recent ferns is of no great value, especially in such a case as this, 
where the form of frond has no very distinctive features; but, 
without wishing to attach any importance to the resemblance, 
there is a marked similarity between such a specimen as Pl. VIIT. 
(V. 2794) and Onoclea Struthiopteris, Hoffm,’ the strong flat 
rachis, the angle at which the pinne are given off, and the 
more or less faleate pinnules, all agreeing fairly closely. 
The common species Cladophlebis Whitbyensis (Brong.), to which 
reference has already been made, has been placed by some authors 
in the genus Pteris; by others referred to under the name 
Asplenium; and, more recently, assigned by Raciborski to the 
Osmundacee. It is better, I am inclined to think, to regard this 
Jurassic species as representing a certain widely spread type of 
frond, which, in all probability, includes under the same name 
plants which would be referred to different genera and species 
had we the necessary data to guide us. C. Whitbyensis (Brong.) 
is an excellent example of a Mesozoic fern of doubtful affinity 
with an unusually wide geographical range; it is of very similar 
habit to C. Albertsii (Dunk.). 
The following are some of the records of C. Whithyensis and 
allied forms illustrating the cosmopolitan nature of this particular 
type of frond :— 
Cladophlebis Whitbyensis (Brong.).’ 
Eneianp. Alethopteris Whitbyensis, L. and H., Foss. Flor. pl. exxxiv. 
FRANCE. Cladophlebis Résserti, Saporta, Pal. Frang. sér. ii. vol. i. 18738, 
pl. xxx. fig. 4. 
GrerMANy. Asplenites Résserti, Schenk, Fl. foss. Grenz. Keup. Lias, 
pl. vii. figs. 6 and 7; pl. x. figs. 1-4. 
Huneary. Alethopteris Whitbyensis, Gopp. Andrae, Abh. k.-k. geol. 
Reichs. vol. ii. Abth. in. No. 4, p. 32. 
SWEDEN. Cladophlebis (nebbensis var.) Résserti, Nathorst, Sver. Geol. 
Undersékn. 8vo. 1878. Fl. Hoganis. pl. ii. fig. 1. 
Bornuoum. Asplenium Résserti, Bartholni, Bot. Tid. Bot. For. Kjévenhayn, 
1892, vol. xviii. Heft i. pl. vi. figs. 4-6, pl. vii. figs. 1-2. 
Asplenium nebbense, Bartholni, loc. cit. pl. vil. figs. 3-6. 
1 Luerssen includes Struthiopteris Germanica, Willd., as a synonym of Onoclea 
Struthiopteris, Hoffm. See Rabenhorst’s Krypt. Flora, vol. iii. 1889, p. 485. 
* Hist. vég. foss. p. 321, pl. cix. figs. 2-4. 
