XXVIII] STACHYPTERIS 259 



Synopsis Filicuvi, to include the Dicksonieae. The Fern obviously has 

 nothing to do with the Cyatheae. It appears to find its nearest relation with 

 Loxsomopsis, for it shares an elongated marginal sorus, and oblique or 

 almost vertical annulus, and almost certainly a lateral dehiscence: but there 

 is no cup-like indusium. On the other hand, a near relation with Lygodinm 

 appears improbable, since the character of the annulus is strongly against 

 it. No fixed opinion is possible,but the discovery o{ Loxsomopsis has certainly 

 made a nearer comparison possible with living Ferns of archaic type. The 

 existence of such a Fern as Stacliypteris in Jurassic time is a fact of great 

 interest, as establishing the early occurrence of Ferns with marginal and 

 almost certainly gradate sori. 



BIBLIOGRAPHY 



526. Saporta. Pal. Franc. 11. Vol. i, p. 49, 1873. 



527. Thomas. Stacliypteris Hallei. Proc. Camb. Phil. Soc. Vol. xvi, Part vii, Plate iv, 

 p. 610, 1912. 



