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Onoclea sensibilis Linnaeus
SENSITIVE FERN
Life   Plantae   Pteridophyta   Dryopteridaceae   Onoclea

Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern

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Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern
Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern

Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern
Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern

Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern
Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern

Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern
Onoclea sensibilis, Sensitive Fern
© Copyright Bobby Hattaway 2011 · 5
Onoclea sensibilis, Sensitive Fern

Onoclea sensibilis, Sensitive Fern Fertie stalk
© Copyright Sheryl Pollock 2011 · 5
Onoclea sensibilis, Sensitive Fern Fertie stalk
Onoclea sensibilis
© Copyright Bobby Hattaway 2011 · 3
Onoclea sensibilis

Onoclea sensibilis
© George Yatskievych, 2003 · 1
Onoclea sensibilis
Onoclea sensibilis
© George Yatskievych, 2003 · 1
Onoclea sensibilis

Onoclea sensibilis, Sensitive fern
© Graham Wyatt, 2009-2010 · 1
Onoclea sensibilis, Sensitive fern
Onoclea sensibilis, Sensitive fern
© Graham Wyatt, 2009-2010 · 1
Onoclea sensibilis, Sensitive fern

Associates · map
FamilyScientific name @ source (records)
Aphididae  Amphorophora ampullata @ AMNH_PBI (4)
Dermateaceae  Gloeosporium phegopteridis @ BPI (7)
Dothioraceae  Metasphaeria epipteridea @ BPI (1)
Melampsoraceae  Melampsora scolopendrii @ BPI (2)
Mycosphaerellaceae  Septoria mirabilis @ BPI (2)
Pucciniastraceae  Uredinopsis americana @ 876086A (1); 876086C (1); BPI (19); 876086B (1)

Uredinopsis mirabilis @ BPI (204)

Uredinopsis scolopendrii @ BPI (1)

Uredinopsis @ 847122B (1)
Rhytismataceae  Hypoderma aquilinum @ BPI (2)
Sebacinaceae  Sebacina incrustans @ BPI (1)
Taphrinaceae  Taphrina hiratsukae @ BPI (4)

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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=ONSE ---> https://plants.usda.gov/java/profile?symbol=ONSE
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Following modified from Flora of North America
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FNA | Family List | FNA Vol. 2 | Dryopteridaceae | Onoclea

1. Onoclea sensibilis Linnaeus, Sp. Pl. 2: 1062. 1753.

Sensitive fern, onoclée sensible

Onoclea sensibilis forma hemiphyllodes (Kiss & Kümmerle) Gilbert; O . sensibilis forma obtusilobata (Schkuhr) Gilbert; O . sensibilis var. obtusilobata (Schkuhr) Torrey

Leaves irregularly spaced along stem. Sterile leaves yellow-green, deltate, coarsely divided, 13--34 × 15--30 cm. Petiole of sterile leaf black, 22--58 cm, flattened at base; rachis winged, becoming broader toward apex. Pinnae 5--11 per side, lanceolate; proximal pinnae 9--18 cm, margins entire, sinuate, or laciniate. Sporophyll leaves green, becoming black at maturity, oblong, 7--17 × 1--4 cm. Petiole 19--40 cm, base sparsely scaly. Pinnae linear, 5--11 per side, 2.5--5 cm; ultimate segments revolute to form beadlike structures, 2--4 mm diam. Sori borne on free veins, enclosed by ultimate segments. 2 n = 74.

Sporophylls produced May--October. Open swamps, thickets, marshes, or low woods, in sunny or shaded locations, often forming thick stands; 0--1500 m; St. Pierre and Miquelon; Man., N.B., Nfld., N.S., Ont., P.E.I., Que.; Ala., Ark., Colo., Conn., Del., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Wyo.; e Asia.

Onoclea sensibilis occurs in eastern North America, principally east of the Great Plains. Leaf forms with pinnae intermediate between those of sporophylls and sterile leaves, or with pinnae fertile only on one side of the blade, can occur on plants that also bear normal leaf forms. These do not merit taxonomic recognition (J. M. Beitel et al. 1981).

Onoclea sensibilis resembles Woodwardia areolata (Linnaeus) T. Moore, with which it often grows. Onoclea has entire pinna margins and nearly opposite basal pinnae whereas Woodwardia areolata has serrate pinna margins and alternate pinnae.

As in Matteuccia struthiopteris (Linnaeus) Todaro, sporophylls of Onoclea sensibilis persist through the winter and release the green spores in spring before the sterile leaves expand (R. W. Hill and W. H. Wagner Jr. 1974; L. G. Labouriau 1958; R. M. Lloyd and E. J. Klekowski Jr. 1970). Onoclea sensibilis is occasionally cultivated; it has a tendency to spread rapidly and become weedy. The name "sensitive fern" refers to the susceptibility of the leaves to even a light frost.

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Onoclea+sensibilis&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Onoclea+sensibilis&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Onoclea+sensibilis&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2018-05-23 10:00:23 gmt
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