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21. Dryopteris sect. Diacalpe (Blume) Li Bing Zhang, Taxon. 61: 1209. 2012.

红腺鳞毛蕨组 hong xian lin mao jue zu

Authors: Wang Faguo, Prof. Fuwu Xing, Li-Bing Zhang & David S. Barrington

Diacalpe Blume, Enum. Pl. Javae 2: 241. 1828.

Plants terrestrial, moderate-sized. Rhizome short, ascending to erect, densely clothed with castaneous scales; scales broadly lanceolate, entire, with a few clavate, short hairs on adaxial side. Fronds tufted; stipe long and densely covered with brown scales, with thick longitudinal groove; lamina ovate or narrowly ovate, tripinnate to quadripinnatifid, papery, dark brown or green when dry, basal pinnae largest, pinnules anadromous; pinnae narrow, regular upward, pinnules catadromously arranged; ultimate pinnules with salmon pink or yellow globose glands along veins abaxially, sparsely covered with short nodose hairs adaxially; rachis and rachillae covered with small scales and short nodose hairs, grooved on adaxial side; veins free, pinnate, veinlets submarginal. Sori globose, basal or abaxial on basal acroscopic veinlets of ultimate pinnules, one in each ultimate pinnule; indusium inferior, globose, castaneous, leathery, enclosing sori when young, dehisced into 2 or 3 valves from top when mature; apophyses elevated, semicircular; sporangia with thin stipe, annuli longitudinal and interrupted, consisting of 14-16 thickened cells; spores bilateral, narrowly elliptic, with coarsely ribbed perispore. x = 41.

About eight species: tropical and subtropical Asia, Pacific islands, Caribbean islands, and South America; eight species (five endemic) in China.

1 Primary segments of lower pinnae truncate apically and shallowly undulate on margin; ultimate segments rounded apically and entire or slightly toothed on margin.   165 D. annamensis
+ Primary segments of lower pinnae acuminate or obtuse apically and toothed, ?pinnatifid on margin   (2)
2 (1) Rachis and rachillae of every order abaxially glabrous or subglabrous; primary segments obtuse apically and with only 3-7 teeth.   164 D. medogensis
+ Rachis and costae of every order abaxially with scales or scales fallen leaving scabrous surfaces; primary segments acuminate or mucronate and with only 2 or 3 teeth   (3)
3 (2) Plants slender; pinnae strongly angled upward; lamina nearly without glands   (4)
+ Plants robust; pinnae slightly angled upward; lamina with glands along veins   (5)
4 (3) Plants ca. 80 cm tall; lamina 40-45 cm, ca. 30 cm wide, basalmost pinnae 23-28 cm, angled slightly upward.   162 D. kungiana
+ Plants 30-35 cm tall; lamina ca. 20 cm, 6-9 cm wide, basalmost pinnae ca. 10 cm, angled strongly upward.   163 D. adscendens
5 (3) Acroscopic primary segments 1-1.5 cm apart from rachis; non-basal pinnae subsessile.   158 D. christensenae
+ Acroscopic primary segments 3-5 mm apart from rachis; pinnae obviously stalked   (6)
6 (5) Pinnules ?right-angled with rachillae; sori ca. 1.5 mm in diam.; whole plant densely scaly.   161 D. diacalpe
+ Pinnules angled upward; sori ca. 0.8 mm in diam.; only lower portion of plant densely scaly   (7)
7 (6) Pinnae with stalk 5-10 cm and pinnules shortly stalked.   159 D. pseudocaenopteris
+ Pinnae and pinnules sessile.   160 D. hookeriana

Lower Taxa


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