IX.—Stamnostoma huttonense gen. et sp. nov.—a Pteridosperm seed and cupule from the Calciferous Sandstone Series of Berwickshire

Abstract

SynopsisStamnostoma huttonense is a petrified seed assigned to the Lagenostomales. The open upper part of its integument shows no lobes or chambers. The short wide salpinx is inserted within a relatively wide “micropyle” and is partly invaginated into the top of the lagenostome which usually contains pollen. The female gametophyte is known, it has a domed “tent-pole” and three archegonia.The paired cupules had sixteen or more terminal segments. Abscission scars indicate that four seeds were borne in each cupule though some were abortive. The cupules if preserved as compressions would resemble the genus Calathiops Göpp.