|Reconstruction of the leafy crown of a Psaronius tree by
From research on coal balls from the USA it is known that the leaves of Psaronius are of the Pecopteris-type because petioles with attached leaves has been found. Many of these leaflets still have the sporangia. These are fused in a characteristic way into synangia. Leaves of Pecopteris bearing such synangia are called Scolecopteris (at the bottom of the drawing).