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Plants of Taiwan

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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: 79


    11. OSMUNDACEAE m
    CHARLES E. DEVOL
    Terrestrial ferns; caudex usually erect, stout; without scales on either caudex or stipes. Fronds circinnate; venation free. Sporangia borne in clusters on the sides of the pinna-axis (one genus has sporangia borne on the back of normal lamina. but this genus is not found on Taiwan); stalk short; dehiscence by a vertical slit over the apex.
    Three genera, with about 19 species, one genus in Taiwan.
    1. OSMUNDA L. m
    Large terrestrial ferns; caudex covered with persistent leaf bases. Fronds borne in a dense spiral tuft; stele small; cortex large; stipes broadened at base, bearing stipular-like wings, covered with mucilaginous hairs on very young fronds; upper part of stipe usually with long, soft, tangled hairs on young fronds; (especially abundant on fertile fronds); c. s. of stipe with a single "C"-shaped vascular bundle. Fronds pinnate, bipinnatifid or bipinnate; fertile and sterile fronds dimorphic or with fertile pinnae distinct from sterile (usually without any chlorophyll bearing blade); venation free, pattern of venation differs in the subgenera. Sporangia sub- globose, with thickened cells on one side, dehiscing into 2 equal parts by a slit over the apex; spores green, short-lived globose, trilete.
    20 species, four in Taiwan.
    Presl divided this genus into three sections, many prefer to treat his sections as distinct genera.
    KEY TO THE SECTIONS
    1. Fronds bipinnate or bipinnatifid, withering in winter.
    2. Fronds bipinnate. . . . . KKKKKKKKKKKKKKKKKKKKKKK. .. Sect. Osmunda
    2. Fronds bipinnatitid . . .. KKKKKKKKKKKKKKKKKKKKK..Sect. Osmundastrum
    1. Fronds pinnate, evergreen. . . KKKKKKKKKKKKKKKKKKKKK.... Sect. Plenasium
    KEY TO THE SPECIES
    1. Sterile fronds pinnate, the margins serrate; fertile pinnae medial or basal on otherwise
    sterile fronds KKKKKKKKKKKKKKKKKKKKKKKK...KK..4. O. banksiaefolia.
    1. Sterile fronds bipmnatifid or bipinnate
    2. Sterille fronds bipinnate; fertile fronds usually distinct from sterile, (occasionally with
    fertile pinnae terminal). . . . . . . . . . . . . . . . . . . . . . . . . KKKKKKKKKK... .. 1. O. japonica
    2. Sterile fronds bipinnatifid
    3. Fertile fronds distinct from sterile KKKKKKKKKKKKK2. O. cinnamomea
    3. Fertile fronds with 2-3 pairs of fertile pinnae borne on lower half of frond (but not