The Great Stone Tree - Glossopteris titanodendrum-dactylophyllum W. was discovered as a 52 foot diameter fossilized tree stump by the First Wizard, who chiseled out the Heart of the Staff from its center. In search of what he believed to be Meri Greenwood the Fairy's source of commanding renewal power, the Heart of the Forests or Calon Fforydd, he found it standing upright, exactly where it had grown, surrounded by sections of its trunk and a layer of its own fossilized fallen leaves, in the middle of the exposed Permian deposit, known as the Koad Karreg or Stone Forest on the south edge of the Mammvro on the Dark Continent. It differs from other glossopterids by virtue of its immense size and by its deeply lobed leaves. Sections of its trunk add up to a tree which could not have been any less than 530 feet tall, and with the size of its stump, it remains the largest individual tree ever discovered. The Koad Karreg is the Permian location of the South Pole, which shifted to its present position with the multiple impacts of asteroids which closed the Age of Fishes. Compasses do not work reliably in the forest, and under its perpetual cloud cover, many a traveler has vanished.
Since the Great Stone Tree is where the Heart of the Staff came from, there are indirect references to it in each book of The Heart of the Staff, but particularly so in
Carol Marrs Phipps & Tom Phipps