深裂双盖蕨 shen lie shuang gai jue

Allantodia metcalfii (Ching) Ching.

Plants medium-sized. Rhizome short and erect, apex like base of stipe, densely scaly; scales brown, linear-lanceolate, ca. 1 cm, membranous, margin black, toothed; fronds caespitose. Fertile fronds 80-100 cm; stipe brown at base, upward stramineous, 30-40 cm, 4-5 mm in diam., subglabrous, shallowly grooved adaxially; lamina 1-pinnate with pinnatipartite pinnules or 2-pinnate at base, deltoid-ovate, up to 60 × 45 cm at base, apex acuminate; pinnae 8-12 pairs, alternate, ascending, ca. 9 cm apart, with stalk ca. 2 cm; lower pinnae narrowly oblong-lanceolate, 30-35 × 5-7 cm, base slightly shortened, truncate, pinnatipartite or pinnatisect to costa, apex acuminate; middle to distal parts with shallowly deltoid or dentate lobes; pinna lobes 10-15 pairs, spreading, contiguous, imbricate, ovate-oblong, entire, 2-3 × ca. 1.5 cm, base narrowed and cuneate, adnate to narrow wings, basal 1 pair of pinna lobes sometimes completely free, adnate, apex shortly acuminate; veins prominent, pinnate, veinlets 8-10 pairs, ascending, mostly forked, apical veinlets simple. Lamina thinly herbaceous, dark brown adaxially when dry, glabrous; rachis stramineous, deeply grooved adaxially, rachis and costa abaxially with brown linear scales. Sori linear, up to 1 cm, 6-8 pairs per lobe, ± approximate, ascending, from midrib to near lamina margin; indusia brown, linear, membranous, persistent.

● Forests in wet areas. N Guangdong (Wengyuan).