Abstract
It has long been thought that a potentially distinct species of Lastreopsis occurs on Raoul Island in the Kermadec Islands, and it is here described as L. kermadecensis Perrie et Brownsey sp. nov. It has been allied with L. glabella or L. pacifica , but is morphologically most similar to L. smithiana from eastern Australia, sharing similar indumentum, gland and rhizome characteristics. Lastreopsis kermadecensis differs from L. smithiana in having less‐divided fronds with fewer catadromous primary pinnae, some clathrate scales on the stipes, larger spores and in being tetraploid. Its conservation status has previously been rated as At Risk/Naturally Uncommon IE, OL . Additionally, notes are provided on the circumscription of L. pacifica , particularly with regard to Samoan material which may be distinct.