Limestone Oak Fern (Gymnocarpium robertianum)

Overview

Limestone Oak Fern (Gymnocarpium robertianum) is a small, delicate fern that grows exclusively on limestone, with a distinctive scent when crushed.

Taxonomy

Description

Fronds are 10–20 cm long, tripinnate, with a triangular outline, pale green. The fronds are glandular, emitting a balsamic scent when bruised. Sori are round, naked, along the veins.

Habitat and Cultivation

Found on limestone rocks and scree in cool, shaded sites. In cultivation, requires alkaline, moist, well-drained soil and shade. Difficult; best in limestone rock gardens.