200 



D. H. Scott. 



of the seeds, and the way in which thej^ were borne, on the rachis 

 of somewhat reduced fertile fronds. 



The structure of other seeds of the Lagenostoma group has been 

 investigated, but there is not yet any conclusive evidence as to 

 their attribution, though there can be no doubt of their relation to 

 Lyg-inodendreae. 



Mr. Ividston's important discovery of the male organs of Lyyino- 

 dendron oldliamium^), completing our knowledge of the plant, has 

 been referred to above (p. 188) in connection with the question of 



/ /T 



Figf. 31. Lagenostoma Sinclairi. Portion Fig. 32. L. Sinclairi. Two seeds 



of "branched rachis bearing ci;pulate seeds. enclosed in cupules and borne on 



Xat. Size. After Arber. branches of the rachis. X 5. After 



A r b e r. 



Marattiaceous fructifications. The fertile pinnules occur on the same 

 fronds which bear the ordinary vegetative leaflets, so that the author 

 was able to demonstrate direct organic connection with the foliage of 

 Lij(jinodendron. The fertile lobes are pedicellate, oval in form, and 

 each of them bears from 6 to 8 lanceolate, sharply-pointed micro- 

 sporangia, described by Mr. Kids ton as bilocular. When A'oung the 

 microsporangia are bent inwards, with their apices meeting at the 

 centre, but at maturity they spread outwards, appearing like a fringe 

 hanging from the margin of the pinnule, though in reality attached 



*) Kid s ton, Prelim: Note on Occurrence of Microsporangia in organic 

 Connection with Foliage of Lyginodendron, Proc. Eoj^al Soc. Vol. 76, 1905; On the 

 Microsporangia of the Pteridospermeae, Phil. Trans. Roj-al Soc. (B), 1906. 



