ARCHEGONIUM AND SPOROPHYTE OF TREUBIA INSIGNIS 273 
some respects much more like Geothallus, which in turn is unmistak- 
ably closely related to Sphaerocarpus. It is possible that the Fossom- 
bronia line (including Petalophyllum, Noteroclada and Treubia) is 
a direct development of the Sphaerocarpus type and is not closely 
related to the Pellia line (Codoniaceae). Moreover it is not unlikely 
that from the Fossombronia line, the Acrogynae (or part of them) 
have originated. Should this hypothesis be correct, it would necessi- ♦ 
tate the removal of the series of forms — Fossombronia, Treubia — 
from the Codoniaceae and their association with the Sphaerocarpales. 
