首頁   計劃介紹    

English Version

Plants of Taiwan

  • plantname
  • planetbook
  • 回目錄頁

    台灣植物誌 第二版  Flora of Taiwan, 2nd edition    Vol. 1

      / 654
    last page

    上一頁

    台灣植物誌第二版  Flora of Taiwan, 2nd edition  1: 80

     8. OSMUNDACEAE 紫萁科
    SHIEH, WANG-CHUENG

    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 in Taiwan); stalk short; dehiscence by a vertical slit over the apex.

    1. OSMUNDA L. 紫萁屬

    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 youg 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 subglobose, with thickened cells on one side, dehiscing into 2 equal parts by a slit over the apex; spores green, short-lived globose, trilete.
    Twenty species, four in Taiwan.

    KEY TO SPECIES
    1. Sterile fronds pinnate, the margins serrate; fertile pinnae medial or basal on otherwise sterile fronds… 1. O. banksiifolia
    1. Sterile fronds bipinnatifid or bipinnate.
    2. Sterile fronds bipinnate; fertile fronds usually distinct from sterile (occasionally with fertile pinnae terminal)… 4. O. japonica
    2. Sterile fronds bipinnatifid.
    3. Fertile fronds distinct from sterile… 2. O. cinnamomea
    3. Fertile fronds with 2-3 pairs of fertile pinnae borne on lower half of frond (but not basal)… 3. O. claytoniana

    1. Osmunda banksiifolia (Pr.) Kuhn in Ann. Mus. Bot. Lugd. 4: 299. 1869; DeVol in F1. Taiwan 1: 81. pl. 24. 1975. 粗齒革葉紫萁 Pl.26, Photo 43
    Osmunda bromeliaefolia auct. Non Copel.: Ogata, Icon. Fil. Jap. 5: p1. 237. 1933.
    Plenasium banksiaefolium (Pr.) Tent., Pterid. 110. 1836; Tagawa in Journ. Jap. Bot. 17: 699. 1941.
    Fronds up to 1.5 m tall; texture subcoriaceous; stipe and rachis grooved above; pinnae lanceolate, petiolate, articulate, 15-25 cm long, about 2 cm broad, the margins coarsely serrate; veins in groups with anterior set of veinlets repeatedly forking, running to the sinus; fertile pinnae dark brown, basal or medial. Sporangia borne in clusters on the pinna-axis.
    Distributed in the Philippines, China, Taiwan, the Ryukyus and Japan. Growing along stream banks, on hillsides and forest floors.
    TAIPEI: Fulung, Kuo 264; Hsintien, DeVol 8352. ILAN: Suao, Kuo 2680. MIAOLI: Shantaowenchuen, Kuoh 275. TAICHUNG: Taken, Shieh s. n. 1967. NANTOU: Chingshuikou, Huang 375; Lienhuachih, Shieh & Tsai 3475*. CHIAYI: Shiutao, DeVol 7203. TAINAN: Kuantzuling, DeVol 8187. TAITUNG: Chihpen, Shieh