Struthiopteris spicant

The clearest way to recognize Struthiopteris spicant is by its two distinct frond types growing from the same plant. Sterile fronds lie flatter and spread outward, with flat, wavy-margined leaflets measuring 5 to 8 millimeters wide. Fertile fronds stand more upright and bear much narrower leaflets, each marked underneath by two thick rows of sori, the spore-producing structures that distinguish them at a glance from the sterile growth.

This dimorphism, the pairing of two leaf forms with different jobs, is the fern's most distinctive feature and makes it relatively easy to separate from similar-looking ferns that produce only one uniform type of frond.

Struthiopteris spicant has a wide native range spanning Macaronesia, northwestern Africa, Europe, and east to Iran, with a separate presence from Alaska south through western Canada into California, Idaho, Oregon, and Washington. Within Europe it is recorded from Iceland and Scandinavia south to the Mediterranean islands of Corsica, Sardinia, Sicily, and Crete, and east through the Baltic states, Ukraine, and the Caucasus.

The species favors cool, moist, temperate conditions and is hardy down to -20°C. Its evergreen habit lets it persist through winter in these climates, reaching a height of about 0.5 meters.

Observation records through the year show a pronounced rise from spring into a peak around midsummer, tapering off toward late autumn and winter, consistent with a plant that is most visible and actively growing during the warmer months, though such records reflect observation activity rather than the fern's actual abundance or full range.

Struthiopteris spicant is a perennial fern that reaches roughly 0.5 meters in height. Its evergreen foliage persists through the year, allowing the plant to remain visible and green even through cold winters in its hardy range down to -20°C.

The root, shoots, and leaves of Struthiopteris spicant have been used as a famine food, cooked for consumption in times of scarcity. Beyond subsistence use, the plant has ornamental value: it has received the Royal Horticultural Society's Award of Garden Merit, a recognition of its qualities as a garden plant.

1. The species was first described in 1753 by Carl Linnaeus, who classified it as Osmunda spicant.
2. Since then it has been shuffled through a wide range of genera, including Blechnum, before being placed in Struthiopteris under the Pteridophyte Phylogeny Group classification of 2016 (PPG I).