Calcareous soil habitats.
The Fern Horisme tersata, has now been split in to two species. The new Cryptic Fern Horisme radicaria appears to have been hiding in plain sight for a number of years. Extremely hard to separate and dissection required to confirm any potential specimens of Cryptic Fern. See next species.
Recorded in 33 (45%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2021.