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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: 141


    18. PLAGIOGYRIACEAE F
    CHARLES E. DEVOL AND CHIN - YI LU
    Mostly medium sized terrestrial ferns, occasionally with dwarf forms; rhizome usually short, stout, erect, cylindrical, covered with overlapping leaf bases; stipes swollen, usually triangular or tetragonal at the base, often narrowly winged, without scales or true hairs but bearing glandular twisted hairs on young stipes; aerophores usually present on base of stipe. Fronds dimorphic, tufted; fertile fronds usually longer than the sterile; lamina deeply pinnatifid or pinnate, the veins free, simple or once forked. Sori protected when young with the scarious reflexed margin; sporangium with a complete oblique annulus, the stalk long; lip cells borne near base of sporangium; paraphyses usually intermingled with the sporangia; spores trilete, rounded-triangular in shape; laesurae open or closed; exine usually with gemmate processes.
    Ferns growing on forest floors in the mountains of the subtropical and tropical regions of the world.
    @@@@@@@@1. PLAGIOGYRIA Mett. FCharacters of the family.
    One genus and about 50 species, eight taxa on Taiwan.
    KEY TO THE SPECIES
    1. Lower pairs of pinnae petiolate
    2. Fronds glaucous beneath 3. P. glauca philippinensis
    2. Fronds without white powder beneath
    3. W!th aerophores on upper part of stipe and rachis 2. P. euphlebia grandis
    3. Without aerophores on upper stipe and rachis
    4. Sterile frond shorter than fertile; only uppermost pair of pinnae adnate at base,
    all o.ther upper pinnae much constricted at base ...1. P. euphlebia
    4. Sterile frond as long or longer than fertile; upper 1/3 or ? of frond with adnate
    @@@@@@pinnaeKKKKKKKKKKKKKKKKKKKKKKKK.. 8. P. koidzumii
    1. Lower pair of pinnae adnate
    2. Lower pinnae suddenly reduced to auricles 7. P. stenoptera
    2. Lower pinnae not reduced to auricles
    3. Lower pinnae d~f1exed, c. s. of upp~~ stipe triangular ...6. P. dunnii
    3. Lower pinnae Wl.dely spreadmg, sometimes shortened; c. s, of upper stipe tetragonal .
    4. Apex o~ sterile frond pinnatifid, or often with a much lobed terminal segment;
    lower pinnae narrowed at base on abaxial side, recurrent on adaxial side KKKKKKKKKKKKKKKKKKKKKKKKKKK..K..4. P. adnata
    4. Apex with a terminal segment much like the lateral pinnae; lower pinnae narrowed
    @@@@@on both sides at base . . . . . . . . . . . . . . . . . . . . KKKKKK.... . . . . . 5. P. japonica
    1. P1agiogyria euphlebia (Kunze) Mett., Farngatt. Plagiogyria 10, 6. 1858; Copel.