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FOC | Family List | FOC Vol. 2-3 | Hypodematiaceae

1. Hypodematium Kunze, Flora. 16: 690. 1833.

肿足蕨属 zhong zu jue shu

Authors: Zhang Gangmin & Kunio Iwatsuki

Plants mostly rupestral (on rocks or walls), medium-sized or small. Rhizomes shortly creeping or ascending, stout, dictyostelic, densely covered with large scales; scales persistent, light brown, lustrous, ovate-lanceolate or rarely linear-lanceolate, margin entire or seldom denticulate, apex acuminate. Fronds approximate or subclustered; stipe stramineous, base swollen into shuttle form and concealed in scales, with 2 vascular bundles, upward usually glabrous, pubescent, or glandular; lamina ovate-oblong to pentagonal-ovate, truncate at base, 3-pinnate to finely 4-pinnate-pinnatifid, anadromous, basal pinnae largest, upper ones gradually reduced, herbaceous or papery, both surfaces, rachises, and costules frequently covered with acicular and/or glandular hairs, rarely glabrous. Veins free, pinnate, branches simple or forked, ending at margin. Sori orbicular, located at middle of veinlets; indusia persistent, large, reniform or horseshoe-shaped, membranous, ± covered with acicular or glandular hairs, rarely glabrous. Spores ellipsoid, bearing prominent, inflated folds with papillate elements. x = 41, 40.

About 16 species: mainly in subtropical and warm-temperate regions of Asia and Africa; 12 species (eight endemic) in China.

1 Fronds ?covered with rod-shaped, glandular hairs abaxially   (2)
+ Fronds not covered with rod-shaped, glandular hairs abaxially   (6)
2 (1) Rachis and costae with grayish white soft hairs mixed together with glandular hairs   (3)
+ Fronds only covered with rod-shaped, glandular hairs abaxially, without grayish white soft hairs   (4)
3 (2) Plants up to 85 cm tall; fronds 5-pinnatifid; stipes glabrous; indusia large, covered with long soft hairs.   8 H. daochengense
+ Plants up to 56 cm tall; fronds 4-pinnatifid; stipes and indusia covered with short hairs and golden glandular hairs.   9 H. glanduloso-pilosum
4 (2) Fronds thickly papery; stipes usually shorter than fronds; sori usually confluent when mature; indusia light brown, glabrous or with 1 or 2 glandular hairs.   12 H. glandulosum
+ Fronds thin, herbaceous; stipes usually longer than fronds; sori separate from each other when mature; indusia grayish white, sparsely glandular hairy   (5)
5 (4) Stipes glabrous; second and upper pairs of pinnae oblong-lanceolate, apex acuminate, base rounded-cuneate.   10 H. sinense
+ Stipes sparsely glandular hairy; second and upper pairs of pinnae oblong, apex obtuse or acute, base cordate.   11 H. fordii
6 (1) Fronds and indusia glabrous.   7 H. glabrum
+ Fronds and indusia ?covered with hairs   (7)
7 (6) Indusia densely covered with grayish white acicular hairs   (8)
+ Indusia sparsely shortly hairy   (10)
8 (7) Stipe and rachis densely covered with hairs.   1 H. crenatum
+ Stipes except base glabrous   (9)
9 (8) Pinnule lobes acute, apex without teeth; lamina without reddish brown and lanceolate scales abaxially.   2 H. villosum
+ Pinnule lobes oblong, apex with 2-4 teeth; lamina with reddish brown and lanceolate scales abaxially.   3 H. hirsutum
10 (7) Plants up to 60 cm tall; stipes except base glabrous; indusia reddish brown.   4 H. taiwanense
+ Plants 20-40 cm tall; stipes covered with grayish white hairs; indusia pale gray   (11)
11 (10) Rachis and costae densely covered with short hairs.   5 H. gracile
+ Rachis and costae densely covered with hairs and sparsely mixed with reddish brown, linear-lanceolate scales.   6 H. squamuloso-pilosum

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