Ophioglossum reticulatum, the netted adder's-tongue, is a species of fern in the family Ophioglossaceae. It has a pantropical/pansubtropical distribution; Latin America, the Caribbean, Sub-Saharan Africa, Madagascar, Yemen, the Indian Subcontinent, Southeast Asia, warmer parts of China, Malesia, Korea, Japan, and many tropical islands. It is a hexaploid and has the highest known number of chromosomes of any plant, 720. Its leavesâÂÂor leaf, individuals only grow one per yearâÂÂare edible, and are regularly consumed by people in Africa and Asia.