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Fronds of Polystichum acrostichoides are dimorphic. The
distal pinnae of fertile fronds are
reduced in size and the abaxial
(under) surface is essentially covered with sori. Blades are
once pinnate and there is an auricle
(conspicuous lobe) pointing toward the tip of the blade at the
base of each sterile pinna. Sterile pinna margins also bear spiny-tipped
teeth.
P. acrostichoides ranges from Nova Scotia to Florida,
west to Texas and Minnesota. In Wisconsin is listed as a "special
concern" species. It is found primarily in the
southern counties and at two locations in the Door peninsula,
in a variety of habitats.
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