familyDryopteridaceae
genusAthyrium
Show Lower Taxa
Difference between revisions of "Athyrium"
Tent. Fl. Germ. 3(1,1): 31, 58. 1799.
Common names: Lady fern
Etymology: Greek athyros, doorless the sporangia only tardily push back the outer edge of the indusium
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>generally terrestrial. <b>Stems</b> short-creeping or ascending, stolons absent. <b>Leaves</b> monomorphic, usually dying back in winter. <b>Petiole</b> ± 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. <b>Blade</b> lanceolate to elliptic or oblanceolate, 1–3-pinnate-pinnatifid, gradually reduced distally to confluent, pinnatifid apex, herbaceous. <b>Pinnae</b> 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. <b>Veins</b> free, simple or forked. <b>Sori</b> 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. <b>Spores</b> brownish, rugose. <b>x</b> = 40.</span><!-- |
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|Sori round, submarginal; indusia much reduced or usually absent. | |Sori round, submarginal; indusia much reduced or usually absent. | ||
| − | |[[Athyrium | + | |[[Athyrium distentifolium var. americanum|Athyrium distentifolium var. americanum]] |
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Latest revision as of 21:24, 5 November 2020
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.
Distribution
Worldwide.
Discussion
In species outside the flora stems are sometimes long-creeping to erect, with leaves radially or dorsiventrally arranged.
Species about 180 (2 in the flora).
Selected References
Lower Taxa
Key
| 1 | Sori round, submarginal; indusia much reduced or usually absent. | Athyrium distentifolium var. americanum |
| 1 | Sori elongate or hooked, medial; indusia well developed. | Athyrium filix-femina |