About Polypodium cambricum L.
Polypodium cambricum L. is a perennial fern. It has an elongate rhizome that often grows above ground, and is densely covered in rusty scales. Its fronds are arranged in two rows, range from 5 to 30 centimetres (2.0 to 11.8 inches) in length, are glabrous, and have a deltoid overall shape. The petiole is yellowish green, and is shorter than the pinnatipartite leaf blade. The frond has 5 to 28 segments on each side; each segment has a toothed margin and a prominent strong midrib. Round sori, 2–4 millimetres (0.079–0.157 in) in diameter and orange-yellow in colour, grow arranged in rows on each side of the segment midrib. Spore-bearing structures develop from February to July. Two cultivars of this species have earned the Royal Horticultural Society's Award of Garden Merit: 'Grandiceps Fox' of the Cristatum Group, listed under the name 'Cambricum'.
