1. Vascular bundle (Amphiphloic) from the rhizome of Osmunda ferns: Another Osmunda vascular bundle view showing the darkly stained endodermis: Osmund a vascular bundle surrounded by ring of thick-walled fibers: Vascular bundle (plectostele) from a Lycopodium stem: Selaginella stem with close-up of vascular bundle: Another view of a vascular bundle from Selaginella