Lygodiaceae M.Roem.

Family

Pteridophytes > Schizaeales

Characteristics

Homosporous climbing ferns. Rhizome subterranean, short-or long-creeping, dichotomously branched, protostelic, clothed with septate hairs, bearing a few or numerous fibrous roots. Fronds circinnate, exstipulate, clustered along rhizome, dimorphic to trimorphic. Juvenile fronds of definite growth, once-forked into 2 palmately branched pinnae; climbing fronds with a wiry rachis of indefinite growth, climbing and twining to 10 m or more; primary rachis branches alternate, 1–16 mm long with a hairy, dormant apex, each bearing a pair of secondary 1–3-pinnate pinnae; sporogenous and sterile pinnae similar or dissimilar; ultimate pinnules distinctly stalked or palmatilobate or pinnatilobate, sometimes articulated at base of laminal portion. Sporangia borne separately in 2 rows on marginal lobes of pinnules, or on a wholly sporogenous segment, each near a vein ending and covered by an 'indusium'. Spores tetrahedral-globose, trilete. Gametophyte asymmetrically cordate, flat, chlorophyllous.
More
Plants terrestrial. Stems branched, slender; fronds often more than several meters, alternately pinnate, climbing by means of a twining rachis; primary blade divisions (pinnae) pseudodichotomously forking with a dormant apical bud in axils; pinnules entire to palmately or 1-or 2-pinnate or more divided; fertile and sterile pinnae similar or fertile pinnae greatly contracted; veins free or anastomosing; sori on lobes of ultimate segments; sporangia abaxial, solitary, 1 per sorus, each sporangium covered by an antrorse indusium-like subtending flange; spores 128-256 per sporangium, tetrahedral and trilete; gametophytes green, cordate, terrestrial. x = 29, 30.
Plants terrestrial. Stems subterranean, protostelic; indument of dark, dense hairs. Leaves vinelike, of indeterminate growth. Pinnae reduced to short stalks, each bearing a pair of opposite pinnules, usually with an often dormant apical bud. Sporangia in 2 rows, 1 on each side of midvein of contracted, oblong, marginal lobes of ultimate segments, covered by hoodlike flap of tissue serving as indusium. Spores tetrahedral-globose, trilete, rarely monolete. Gametophytes terrestrial, cordate, glabrous.
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Root system creeping-root fibrous-root rhizome
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Images

Lygodiaceae unspecified picture

Distribution

Lygodiaceae world distribution map, present in Australia and China

Identifiers

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WFO ID wfo-7000000355
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INPN ID 658441
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Lygodiaceae

Lower taxons

Lygodium