Dryopteris wallichiana (Spreng.) Hyl. ssp. reichsteinii Fraser-Jenk.
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Common name |
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Description |
Rhizome short, erect to suberect, forming a caudex of up to 16 × 8 cm; rhizome scales chestnut coloured, broadly attached, to 1.5 x 0.2 cm, cordate, margins with outgrowths. Fronds arising in a whorl, arching, firmly herbaceous, to 1.2 m long. Stipe up to 20 cm long, chestnut coloured at the base, paler higher up, densely covered with brown scales of 2 kinds. Lamina up to 1.2 × 0.38 m, narrowly oblanceolate to narrowly elliptic in outline, pinnate-pinnatifid to deeply bipinnatifid, with up to 47 pinna pairs, pinnae gradually reduced towards the base. Pinnae c. 20 × 2.5 cm, sessile to shortly stalked, set at 90° to the rhachis, narrowly oblong-attenuate, deeply pinnatifid; ultimate lobes rectangular, c. 16 × 7 mm, apices cut-off squarely, serrate, lateral margins subentire, glabrous but with few linear scales on the margins, costules and costae, venation evident on both surfaces. Rhachis densely covered with dark brown scales. Sori round, up to 12 per lobe, to 1.5 mm in diameter, inframedial on vein branches; indusium brown, entire, glabrous, kidney-shaped, to 1.5 mm in diameter. |
Notes | This is a tall, bipinnatifid fern with distinctly cut-off square lobes, not to be confused with other species of Dryopteris. |
Derivation | wallichiana: after N. Wallich (1786-1854), superintendent of the Calcuta Botanic Gardens in 1817; reichsteinii: after T. Reichstein (1897-1996), Nobel prize laureat in 1950, studying ferns after his retirement. |
Habitat | Shaded ravine under Widdringtonia at c. 2100m. |
Distribution worldwide | See African distribution. |
Distribution in Africa |
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Growth form |
Terrestrial. |
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