Selaginellaceae

卷柏科

PPG

Selaginellaceae 卷柏科

特徵描述

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標本列表

特徵描述

作者

TSAI, JINN-LAI and SHIEH, WANG-CHUENG

型態特徵

Perennial herbs. Stems slender, creeping, rooting at intervals or ercet, usually without branches on lower part, rooting near base or with stout, short, densely tufted stems made up of many branches of about the same length, which roll up when dry. Leaves small, simple, with a single vein, always bearing an inconspicuous ligule on the adaxial side at its base (which is only prominent during its early development); vegetative leaves monomorphic and spirally arranged, or more often dimorphic and usually arranged in two median and two lateral rows on the branches, the median leaves usually smaller and of a different shape from the lateral leaves the single axillary leaf (best seen from lower side) borne at the forking of each branch, being somewhat different from othen leaves. Strobili usually borne on the ends and sides of branches; sporophylls quite different from the vegetative leaves, however, a few species do not have the sporophylls in compact strobili; microsporophylls with a single microsporangium which contains a large number of microspores; megasporophylls with a single megasporangium which contains four megaspores; microspores being very much smaller and their color usually different from that of the megaspores; sporangia round or oval, opening by a transverse slit.