68 



BRITISH EOCENE FLORA. 



The discovery, subsequent to the publication of our description, of fertile fronds of 

 Lygodium with very short and completely separated pinnules, closely resembling in 

 their appearance and disposition the specimen described with some doubt as Asplenites 

 pra-allosuroides, has convinced me that this supposed species is only an example of the 

 fertile frond of Lygodium, with exceptionally abbreviated pinnules. The thick car- 

 bonized substance and consequent indistinctness of this and of the original Asplenites 

 allosuroides from Sotzka, is entirely in favour of this view, and both species must, 

 I think, be referred to this species. 



15. Marattia Hookeri, Ett. 8f Gard. (Page 54.) 



Maratfla Hookeri has only been detected at Alum Bay, where it is by no means 

 rare (PL XII, figs, 1 — 6). It appears to be closely allied to M. Kaulfussii, of the West 

 Indies, Columbia, and the Brazils ; more particularly resembling it when the fronds are 

 not fully developed. M. Kaulfussii is the only species belonging to the group Eupodium, 

 separated on account of its shortly stalked synangia without an involucre. No fossil 

 Marattia was known previously, and no other Fern is known from Alum Bay, unless it be 

 Anemia subcretacea, which Heer states to have been found there. ^ 



16. Onoclea hebraidica {Forbes). Plate XIII, figs. 5 and 6. 



FiLiciTES HEBRAiDicx]s,i^or6es. Quarterly Journal Geological Society, vol. vii, p. 103, 



pi. ii, fig. 2, 1851. 



Onoclea sensibilts, L., Newberry. Ann. Lyc. Nat. Hist., N. Y., vol. ix, April, 1868. 

 WooDWAKDiTES AECTicxJS, Heer. Flora fossilis arctica, vol. i, p. 86, 1868. 



0. fronde pinnata, pin?iis oblongis vel linearibus, pinnatijidis, lobis rotundatis, denticu- 

 latis vel infegerrimis ; nervatione Dictyopteridis composite exappendiculata, nervo 

 jprimario subrecto prominente, nervis secundariis tenuibus Jlexuosis, angulo acuto egredien- 

 tibus ; nervis tertiariis brevissimis dictgodromis, maculis Bictyojpteridis 2 — 3 seriatis, 

 incBqualibus. 



From the Ardtun Beds, Mull. 



The material upon which the description of this Fern is based consists of the apex of 



1 This and C. Lanzeeanum are given in Baron Ettingshausen's list of the Alum Bay flora, I think in 

 error, as neither Keeping nor myself have, after years of collecting, ever come across them, and no 

 specimen of either Fern from that locality is now preserved in the national collections. 



