Pteridales
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The Pteridales are ferns that have their sori in linear strips under the edge of the leaf tissue, usually with the edge of the lamina reflexed over.
Most members of this order are small, but some members of the tropical genus Acrostichum, in the Acrostichaceae, are immense, with fronds 3.5 meters (twelve feet) tall.
One of the most well known plants in this order is the maidenhair fern
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