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Family: Dryopteridaceae
[Aetopteron acrostichoides (Michx.) House, moreAspidium acrostichoides (Michx.) Sw., Aspidium acrostichoides var. incisum A.Gray, Aspidium auriculatum Schkuhr, Aspidium schweinitzii Beck, Dryopteris acrostichoides (Michx.) O. Kuntze, Nephrodium acrostichoides var. crispum (Clute) Hopkins, Nephrodium acrostichoides var. incisum (A.Gray) Hopkins, Polystichum acrostichoides f. crispum Clute, Polystichum acrostichoides f. demittens C.F.Reed, Polystichum acrostichoides f. furcatum F.Seym., Polystichum acrostichoides f. gymnosorum Neidorf, Polystichum acrostichoides f. incisum (A.Gray) Gilbert, Polystichum acrostichoides f. lanceolatum Clute, Polystichum acrostichoides f. ligulatum Gruber, Polystichum acrostichoides f. multifida Clute, Polystichum acrostichoides f. multifidum Clute, Polystichum acrostichoides f. orbiculatum Eames, Polystichum acrostichoides f. recurvatum Clute, Polystichum acrostichoides f. spathiforme C.F.Reed, Polystichum acrostichoides f. ventroperaferens Neidorf, Polystichum acrostichoides var. crispum Clute, Polystichum acrostichoides var. incisum A.Gray, Polystichum acrostichoides var. schweinitzii (Beck) Small, Thelypteris acrostichoides (Michx.) Nieuwl.] |
Stems erect. Leaves dimorphic (only in this species); fertile pinnae distal, much contracted; sterile leaves arching, 3--8 dm; bulblets absent. Petiole 1/4--1/3 length of leaf, densely scaly; scales light brown, diminishing in size distally. Blade linear-lanceolate, 1-pinnate; base narrowed. Pinnae oblong to falcate, not overlapping, in 1 plane, 2--6 cm; base oblique, acroscopic auricles well developed; margins serrulate-spiny with teeth ascending; apex acute or blunt with subapical and apical teeth same size; microscales filiform, lacking projections, dense, on abaxial surface only. Sori confluent, completely covering abaxial surface of pinnae (only in this species); indusia entire. Spores light brown. 2 n = 82. Forest floor and shady, rocky slopes; 0--1500 m; N.B., N.S., Ont., P.E.I., Que.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.; Mexico; naturalized in Europe. Polystichum acrostichoides is a common species most closely related to P . munitum (G. Yatskievych et al. 1988), which also occurs extensively on forest floors. The dimorphic pinnae of Polystichum acrostichoides are not unique to the genus; they are found also in some Asian species. Numerous variants have been named, mostly as forms, but none are of taxonomic consequence. Hybrids are known with P . braunii ( P . × potteri Barrington) and P . lonchitis ( P . × hagenahii Cody). The latter hybrid is rare, known only from its type locality in Ontario, where it grows with both parents. It is recognized by its intermediate morphology (leaves wider than P . lonchitis , narrower than P . acrostichoides , with slightly contracted sorus-bearing pinnae) and malformed sporangia and spores. Polystichum × potteri is much more widespread, from Nova Scotia, New Brunswick, and Quebec through New England to Pennsylvania. It resembles P . braunii but has narrower leaves bearing malformed sporangia.
Rhizome short-creeping; lvs 3-7.5 dm, the green petiole a fourth to two-fifths as long as the blade; blade pinnate, 5-12 cm wide, lance- linear, acuminate, not reduced at base; pinnae alternate, 20-35 pairs, linear-oblong, acute, sharply auricled at the upper base, dark green and scaleless above, paler and with hair-like scales beneath; fertile upper pinnae abruptly smaller; sori commonly in 2 rows on each side of the midrib; indusium thick, entire, blackish when dry; 2n=82. Woods and open thickets; N.S. to Wis., s. to Fla., Tex., and Mex. A hybrid with no. 2 [Polystichum lonchitis (L.) Roth] is P. بagenahii Cody. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission. |