sentences:  Further samples came from elsewhere in the Lower Old Red Sandstone (St Maughams Group, lowermost Devonian), where they co-occur with plant spores.Additional, older material occurs with "Hostinella", "Cooksonia" and "Steganotheca" in the Ludlow (upper Ludfordian) Whitcliffe formation.Some material assigned to "Nematothallus" closely resembles certain lichens, suggesting a lichenous habit – although as the lichens evolved at least six times independently, this does not fully establish the genetic affinity.