The rare, tetraploid maidenhair spleenwort (Asplenium trichomanes subsp. quadrivalens) has only recently been rediscovered in New Zealand. Several people have contacted me with possible additional sightings. As described by the Scoop website, Jack Ritchie had a maidenhair spleenwort self-sow on a rock used to construct a water feature in his
The maidenhair spleenwort is a spleenwort fern (Asplenium) that (supposedly) looks like a maidenhair fern (Adiantum, see below). The 600 or so of the world’s spleenworts are characterised by having their reproductive structures in lines away from the margins of their fronds’ undersides. Two maidenhair spleenworts occur in New Zealand.