Dickie's Bladder Fern

Below is an extract from Wikipedia.

The first recorded discovery of the plant was made by William Knight, Professor of Natural Philosophy at Marischal College, Aberdeen in Scotland. Knight came across a small population growing on base-rich rocks in a sea cave (known locally as a "yawn") on the coast of Kincardineshire. The first publication to record it was the 1838 Flora Aberdonenis which included a note of its occurrence written by a pupil of Knight's, George Dickie. Dickie also sent a live specimen to Robert Sim, a nurseryman from Kent, who believed it to be a new species and published his views in the 1848 edition of the Gardener's and Farmer's Journal, naming it C. dickieana.[1]

Rarer British ferns came under severe threat from Victorian fern collectors in the mid 19th century in Scotland, a period of collecting that became known as Pteridomania (or "fern-fever"). In 1860 Dickie reported that the original colony had been extirpated from the yawn where its original discovery had occurred. The evidence for this is conflicting, but today there is a population of more than 100 plants there, where it grows in a roof fissure in the company of Athyrium filix-femina and Dryopteris dilatata.[1][3