拟长果双盖蕨 ni chang guo shuang gai jue

Basionym: Allantodia calogrammoides Ching ex W. M. Chu & Z. R. He, Acta Phytotax. Sin. 36: 377. 1998.

Plants evergreen, large. Rhizome creeping to ascending, brown, up to 5 cm in diam. including remaining stipe bases, apex like base of stipe, densely scaly; scales brown, lanceolate, ca. 1 cm, membranous, margin black, regularly toothed, base subcordate; fronds approximate. Fertile fronds up to 1.8 m; stipe brown at base, upward light brown stramineous, up to 70 cm, ca. 8 mm in diam., upward glabrous, shallowly grooved adaxially; lamina 2-pinnate with pinnules pinnatifid to pinnatisect, deltoid, more than 1 m × 80-90 cm, apex acuminate; pinnae 10-12 pairs, alternate, ascending, nearly symmetrical, apex long acuminate; upper 5 or 6 pairs of pinnae broadly lanceolate or sickle-shaped lanceolate, acroscopic base broadly cuneate, basiscopic base cordate, shortly stalked or sessile, pinnatifid to pinnatipartite, apex ascending, sickle-shaped; middle and lower pinnae oblong-lanceolate, pinnate, stalked; basal pinnae largest, up to 60 × 20 cm, with stalk 2-3 cm; pinnules up to ca. 15 pairs, spreading, alternate, shortly stalked or upper pinnules not stalked, broadly lanceolate or lanceolate, up to 11 × 3 cm, acroscopic base truncate or broadly cuneate, basiscopic base shallowly cordate, sometimes both sides of base cuneate or truncate, basal acroscopic pinnule lobe often shorter, incised ca. 1.5 cm from margin, apex acuminate or long acuminate; pinnule lobes up to ca. 10 pairs, subspreading, alternate, contiguous, broadly oblong, ca. 1 cm wide, margin shallowly crenate or repand, apex rounded; veins visible abaxially, not prominent adaxially, pinnate, veinlets up to 8 pairs per pinnule lobe, usually forked or simple, occasionally 3-furcate or pinnate, ascending. Lamina herbaceous, dark green when dry, glabrous, gray-green abaxially, with slightly small pale brown scales; rachis and costa stramineous, glabrous, shallowly grooved adaxially, costule glabrous abaxially. Sori linear, substraight, up to 6 pairs per pinnule lobe, mostly borne from midrib to 2/3-4/5 of veinlet length, basal acroscopic sori longest, single or double; indusia light brown when mature, thinly membranous, opening acroscopically, persistent. Spores reniform, perispore broad and hyaline, sometimes few rugate, few inconspicuous granular ornamentation.

● Evergreen forests in valleys; 2100-2200 m. Yunnan (Jingdong, Wuliang Shan).

Diplazium calogrammoides is similar to D. calogrammum but differs by the dense scales with black margin, cordate pinnule base, and smooth costa abaxially without green fleshy aculeate processes.