(1) A typical, mature Osmunda cinnamomea gametophyte was cordate and without trichomes.(2) The fruits were cordate at the base instead of truncated as is typical of H. verticillata.(3) Its leaves are small, thin, slightly hairy, alternate, cordate and two to four centimetres long.(4) Ventral muscle field strongly impressed, elevated, cordate , with high ridges laterally and anteriorly.
