Adiantaceae

鐵線蕨科

PPG

Pteridaceae 鳳尾蕨科

特徵描述

屬列表

標本列表

特徵描述

作者

SHIEH, WANG-CHUENG

型態特徵

Terrestrial ferns; rhizome erect, oblique or creeping, solenostelic or dictyostelic, clothed with either hairs of narrow brownish scales. Fronds uniform or rarely subdimorphic, 1-4-pinnate or pedate, rarely simple, not articulate to rhizome; veins free or rarely anastomosing without included free veinlets. Sori superficial, linear, following the course of veins, exindusiate or close to the margin, borne along the apical part of fertile veins on the underside of the sharply reflexed discolored membranaceous or coriaceous leaf-margin, which protects the sori as a false indusia. Sporangia with a vertical annulus, developing in mixed sequence. Spores tetrahedral.

屬

A family of about 20 genera and 300 species, widely distributed in the tropical and temperate regions of the world, seven genera and 23 species in Taiwan .

參考文獻

SHIEH, WANG-CHUENG, Flora of Taiwan, second edition 1: 234. 1994. (Fl. Taiwan 2nd edit.)

Adiantum 鐵線蕨屬

作者

SHIEH, WANG-CHUENG

型態特徵

Rhizome long-creeping or short and ascending, solenostelic, clothed with brown to black, narrow scales. Fronds small or of moderate size; stipes slender, scaly at base, dark and polished, sometimes more or less hairy; lamina pinnately decompound with dimidiate or flabellate pinnules, sometimes simply pinnate, rarely pedate or simple, usually firm-herbaceous, rarely membranaceous or coriaceous, glabrous or less commonly hairy, rarely glaucous; veins free or rarely anastomosing. Sori borne along the veins on the inner face of reflexed marginal outgrowths which thus serve as indusia and also bear the sporangia, these veins approximate, parallel, free; annulus of 13-30 thickened cells. Spores tetrahedral, smooth, without perispore.