Athyrium acrostichoideum

Description

Genus Athyrium

Plants generally terrestrial . Stems short-creeping or ascending , stolons absent. Leaves monomorphic , usually dying back in winter. Petiole ± 0.5 times length of blade or less, base swollen and dentate , persisting as trophopod over winter or not; vascular bundles 2, lateral , lunate in cross section . Blade lanceolate to elliptic or oblanceolate , 1--3-pinnate-pinnatifid, gradually reduced distally to confluent , pinnatifid apex, herbaceous. Pinnae not articulate to rachis, segment margins serrulate or crenate ; proximal pinnae often reduced, sessile to short-petiolulate, ± equilateral ; costae adaxially grooved , grooves continuous from rachis to costae to costules ; indument absent or of linear to lanceolate scales or 1-celled glands abaxially. Veins free , simple or forked . Sori in 1 row between midrib and margin, round to elongate , straight or hooked at distal end, or horseshoe-shaped; indusia shaped like sori, persistent , attached laterally or with narrow sinus, or indusia absent. Spores brownish, rugose . x = 40.

Species about 180: worldwide.

In species outside the flora stems are sometimes long-creeping to erect , with leaves radially or dorsiventrally arranged.Masahiro Kato "Athyrium". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org.

Taxonomy

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Domain: Eukaryota () - Whittaker & Margulis,1978
- Kingdom: Plantae () - Haeckel, 1866 - Plants
  - Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
    - Phylum: Pteridophyta () - Sinnott, 1935 Ex Cavalier-Smith, 1998
      - Subphylum: Euphyllophytina ()
        Infraphylum: Moniliformopses () - Kenrick & Crane, 1997, Nom. Nud.
        Class: Filicatae () - Cronquist Et Al.
        Order: Filicales () - Link
        Family: Woodsiaceae ()
        Genus: Athyrium () - Roth, Tent. Fl. Germ. 3(1,1): 31, 58. 1799. - Lady fern [Greek athyros, doorless; the sporangia only tardily push back the outer edge of the indusium]
        Specific epithet: acrostichoideum - Bory; Merat
        Botanical name: - Athyrium acrostichoideum Bory; Merat

Notes

Publishing author : Bory; Merat Publication : Fl. Paris. ed. IV . 1. 372. 1836 1836

Similar Species

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Members of the genus Athyrium

There are approximately 942 species in this genus. Here are just 100 of them:

A. 'Branford Beauty' · A. 'Branford Rambler' · A. accedens · A. achilleifolium · A. acrocarpum · A. acrostichoides · A. acrostichoideum · A. acrotis · A. aculeatum · A. acutidentatum · A. acutipinnulum · A. acutiserratum · A. acutissimum · A. acutum · A. adpressum · A. adscendens · A. aequibasale · A. aequilaterale · A. affine · A. alatum · A. allanticarpum · A. allantodioides · A. alpestre americanum · A. alpestre × filix-femina · A. alpinum · A. alternifolium · A. altum · A. amabile · A. ambiguum · A. americanum (Alpine Ladyfern) · A. ammifolium · A. amoenum · A. amplissimum · A. amplum · A. andapense · A. angustifolium · A. angustipinna · A. angustisquamatum · A. angustum f. elegans · A. angustum f. laciniatum · A. angustum f. rubellum (Lady in Red Fern) · A. angustum var. laurentianum · A. anisopterum · A. annae · A. aphanoneuron · A. araiostegioides · A. arborescens · A. arboreum · A. archboldii · A. arcuatum · A. aridum · A. arisanense · A. aristulatum · A. arnottii · A. asperum · A. aspidioides · A. asplenioides f. subtripinnatum · A. assimile · A. atkinsonii · A. atomarium · A. atratum · A. atropurpureum · A. atrosquamosum · A. atroviride · A. attenuatum · A. attenuatum f. dentigerum · A. attenuatum f. intermedium · A. augustum · A. auriculatum · A. australe · A. austro-occidentale · A. austro-orientale · A. austro-ussuriense · A. austrooccidentale · A. austroyunnanense · A. axillare · A. azoricum · A. baishanzuense · A. bambusicola · A. banahaoense · A. bantamense · A. baoxingense · A. barbae · A. barnebyanum · A. basilare · A. bellum · A. benguetense · A. bicolor · A. bicolor nothosubsp. shiibaense · A. bijiangense · A. biondii · A. birii · A. biseriale · A. biserratum · A. biserrulatum · A. bittyuense · A. blumei · A. bolsteri · A. bomicola · A. boryanum

Bibliography

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Johnson, D. M. 1986b. Trophopods in North American species of Athyrium (Aspleniaceae). Syst. Bot. 11: 26--31.
Kato, M. 1977. Classification of Athyrium and allied genera of Japan. Bot. Mag. (Tokyo) 90: 23--40.
Liew, F. S. 1972. Numerical taxonomic studies on North American lady ferns and their allies. Taiwania 17: 190--221.