In Bennettites the ovules are left exposed at the apex, but they are by no means so distinctly gymnospermous as.
The seed-like body was detached as a whole from the cone, and in this condition was known for many years under the name of Cardiocarpon anomalum, having been wrongly identified with a true Gymnospermous seed so named a seed are obvious; the which is not tubular, but forms a long crevice, running in a direction radial to the strobilus.
Gymnospermous remains are common in Palaeozoic strata from the Devonian onwards.
The modern Gymnospermous orders have but few authentic representatives in Palaeozoic rocks.
Among Pteridosperms it is the family Medulloseae which is especially characteristic. Cordaiteae still increase, and Gymnospermous seeds become extraordinarily abundant.