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    台灣植物誌 第一版  Flora of Taiwan, 1st edition    Vol. 1

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    台灣植物誌第一版  Flora of Taiwan, 1st edition  1: 302


    30. ADIANTACEAE Ku
    WANG-CHUENG SHIEH
    Terrestrial ferns. Rhizome erect, oblique or creeping, solenostelic or dictyostelic, clothed with either hairs or narrow brownish scales. Fronds uniform or rarely subdimorphic, 1-4-pinnate or pedate, rarely simple, not articulate to rhizome; veins free or rarely anastomosing without included free veinlets. Sori superficial, linear, following the course of veins, exindusiate or close to the margin, borne along the "apical part of fertile veins on the underside of the sharply reflexed discolored membranaceous or coriaceous leaf-margin, which protects the sori as a false indusia; sporangia with a vertical annulus, developing in mixed sequence; spores tetrahedral.
    A family of about 20 genera and 300 species, widely distributed in the tropical and temperate regions of the world; six genera and 20 species in Taiwan.
    KEY TO THE GENERA
    1. Sori exindusiate, superficial, following the course of veins.
    2. Frond glabrous or ceraceous.
    3. Pinna ample and never finely dissected 3. Coniogramme
    3. Pinna small or dissected.
    4. Frond membranaceous, nether surface not ceraceous .2. Anogramma
    4. Frond herbaceous, nether surface ceraceous. . . . . . . KKKK. . . . . 6. Pityrogramma
    2. Frond hairy.
    3. Frond simple and cordate 5. Hemionitis
    3. Frond pinnate 4. Gymnopteris
    1. Sori protected by and borne on the reflexed margin 1. Adiantum
    1. ADIANTUM L. Ku
    Rhizome long-creeping or short and ascending, solenostelic, clothed with brown to black, narrow scales. Fronds small or of moderate SIze; stipes slender, scaly at base, dark and polished, sometimes more or less hairy, lamina pinnately decompound with dimidiate or flabellate pinnules, sometimes simply pinnate, rarely pedate or simple, usually firm-herbaceous, rarely membranaceous or coriaceous, glabrous or less commonly hairy, rarely glaucous; veins free or rarely anastomosing. Sori borne along the veins on the inner face of reflexed marginal outgrowths which thus serve as indusia and also bear the sporangia, these veins approximate, parallel, free; annulus of 13-30 thickened cells; spores tetrahedral, smooth, without perispore.
    At least 200 species, distributed throughout the warmer parts of the world, most numerous in South America; 12 species in Taiwan ..