Japanese name: ミヤマシシガシラ（深山獅子頭） Scientific name:Blechnum castaneum
[Overview]
An evergreen terrestrial fern found in subalpine forests.
It often grows in colonies.
The rhizome is short, ascending, and bears many scales.
The scales are linear, gradually narrowing toward the tip, entire, membranous and brown.
The leaves are of two forms: sterile leaves tufted radially from the rhizome, and erect fertile leaves.
The sterile leaves are once pinnate, about 15–35 cm long and 3.5–6 cm wide, with a short petiole 1–6 cm long; the pinnae are attached almost to the base.
The pinnae are rounded at the tip, and the upper surface has a shallow groove along the midrib.
The fertile leaves are about twice as long as the sterile leaves, with a long petiole 10–18 cm long.
The pinnae are set at rather wide intervals and curve like a sickle.
The sori spread over the underside of the fertile leaves, but a very narrow part at the margin bears no sporangia.
The underside of the petiole and rachis is dark purplish brown, densely covered with fine dots, and rough.
