The leaf margins themselves are often reflexed to form false indusia that protect the sori. |
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It is characterized by large pinnate-pinnatisect leaves, sparse narrowly triangular petiole scales and caducous membranous indusia. |
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All three species are medium-sized, rhizomatous, herbaceous plants with 3-pinnate fronds and orbicular sori covered with reniform indusia. |
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Rumohra further differs by dorsiventral rhizomes with an elongated ventral meristele, leaf axes glabrous adaxially, and peltate indusia. |
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Lack of indusia makes Mesopteris distinct from other genera. |
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Taxonomic and nomenclatural confusion has surrounded species of maidenhair ferns with decompound, non-conform laminae and orbicular to reniform indusia. |
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Indusia opening was used to estimate the timing of spore release. |
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