A mushroom weighing more than 20 kilograms has been picked in a forest in Mexico's southernmost state of Chiapas, university officials say.

The white mushroom, macrocybe titans, measured a towering 70 cm tall, was found near Tapachula, near the Guatemalan border, according to the Southern Border University Centre.

There is no word as to what the researchers plan to do with the specimen.

- AFP/ABC