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Plants of Taiwan

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

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    台灣植物誌第二版  Flora of Taiwan, 2nd edition  1: 27

     PSILOPSIDA 松葉蕨綱

    Vascular plants without roots; aerial stems dichotomously forking; leaves minute, scale-like without a midrib, or microphyllous and with a midrib; sporangia 2-3 locular; spores elliptic.

    1. PSILOTACEAE 松葉蕨科
    DEVOL, CHARLES E. and SHIEH, WANG-CHUENG

    Vascular plants without roots; stems erect or pendent, dichotomously or unbranched; rhizomes mycorrhizal, with a protostele; aerial stem with a siphonostele. Leaves scale-like, lacking midrib, or elliptical with midrib. Sporangia borne in axils of leaves, 2-3 lobed, eusporangiate, homosporous. Gametophyte subterranean, cylindrical, mycorrhizal.
    Two living genera, one in Taiwan.

    1. PSILOTUM Sw. 松葉蕨屬

    Rhizome bearing rhizoids; aerial stems simple below, repeatedly dichotomously branching above. Leaves small, scale-like, scattered, veinless. Sporangia 3-lobed, on adaxial side of the minute leaves; spores bilateral.
    Three species, one in Taiwan.

    1. Psilotum nudum (L.) Beauv., Prodr. Fam. Aetheog. 112. 1805; DeVol in Fl. Taiwan 1: 25. 1975. 松葉蕨 Pl.1, Photo 33
    Lycopodium nudum L., Sp. Pl. 2: 1100. 1753.
    Aerial stems green, erect or pendent, 10-50 cm long, angular; leaves awl-shaped, 1-2 mm long.
    Widely distributed in tropics and subtropics. Terrestrial or more often epiphytic; small plants usuall erect; large plants pendent.
    TAIPEI: Tatungshan, Kuo 2334*. IISINCHU: Manabashan, Do 725. NANTOU: Chingshuikou, Huang 1940. PINGTUNG: Nanjenshan, Kao 73440. TAITUNG: Tawu, Chuang 3461; Is. Lanyu, Huang & Kao 5458. HUALIEN: Chingshuishan, Nakamura 3578.