Lecanopteris mirabilis
Lecanopteris mirabilis is a species of tropical fern in the genus Lecanopteris native to Papua New Guinea and Sulawesi. An epiphyte, its name means "wonderful" or "marvelous". Like others of its genus, it grows from a large rhizome that in this case can be up to  in diameter. This rhizome forms a shelter for ants, making this a myrmecophyte, though unlike others of its genus the rhizome is flattened and doesn't contain hollow galleries. Individual fronds may be up to  long. References

mirabilis
Plants described in 1929
Plants described in 1825
Plants described in 1920