Dryopteris Dryopteris, (Hoffm.) A. Gray

7. D. dilatata (Hoffm.) A. Gray , Man. Bot. North. U.S. 631 (1848)

(D. austriaca auct.).

Rhizome erect or ascending. Leaves 1O-15O(-18O) x 4-40 cm, laxer and not so erect as in 6; petiole from Ì as long to as long as lamina; scales ovate-lanceolate, bicolorous, dark brown or blackish in the centre, pale brown at the margin; lamina triangular-ovate to -lanceolate, 3-pinnate, usually dark green with a few glands beneath; pinnae 15-25 on each side, stalked, triangular-ovate or -lanceolate, pinnate; pinnules oblong-ovate to -lanceolate, pinnate; the proximal basiscopic pinnule of the basal pinna nearly always less than as long as the pinna; third order pinnules ovate to oblong, toothed or pinnately lobed. Sori 0-5-1 mm in diameter; indusium with stalked glands; spores dark brown, with obtuse tubercles. 2/7=164. Europe, southwards to Portugal, Bulgaria and C. Russia. Au Az Be Br Bu Co Cz D a Fa Fe G a Ge Hb He Ho Hs H u Is It Ju Lu No Po Rm Rs (N, B, C, W) Su. D. azorica (Christ) Alston , Bol. Soc. Brot. 30: 14 (1956), which has been described from Açores, has dark, concolorous, almost linear scales on the petiole and rhachis, and a finely dissected leaf with spinulose segments. This may be related to North American plants, and needs further investigation.