On the Arrangement and Structure of the 
Vascular Strands in Angiopteris evecta, 
and some other Marattiaceae. 
BY 
J. BRETLAND FARMER, D.Sc., F.R.S., 
Professor of Botany in the Royal College of Science, London , 
AND 
T. G. HILL, A.R.C.S., 
Demonstrator in Biology at St. Mary's Hospital Medical School, London. 
With Plates XVI, XVII, and XVIH, and a Diagram in the Text. 
T HE Marattiaceae of the present day, comprised in some 
five or six genera, represent the relics of a group which 
in the Palaeozoic age formed one of the great dominant 
groups of vascular cryptogams. And now, though occupying 
a somewhat isolated position, they nevertheless exhibit 
features which point more or less vaguely to an affinity with 
several other groups of plants. It thus becomes a matter 
of some interest that a family of so great palaeontological 
importance should be as thoroughly understood as possible, 
and in particular that the structural details of anatomy should 
be accurately and fully known and appreciated. For it is 
largely on the anatomical evidence as arrived at by a study 
of the vegetative organs, that our views as to the relation- 
ships of these ancient plants for the most part depend. 
But on turning to the existing memoirs on the anatomy 
of the Marattiaceae, one speedily discovers many lacunae in 
[Annals of Botany, Vol. XVI. No. LXII. June, igo2.J 
