Cystopteris


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Related to Cystopteris: fragile fern

Cystopteris

 

(bladder fern), a genus of ferns of the family Polypodiaceae. The small plants have two to four pinnate leaves on small, fragile stalks. There are about 15 species distributed in temperate and subtropical belts. Five species occur in the USSR, mainly on cliffs and mountain slopes. The most well-known species is the almost cosmopolitan fragile fern (Cystopteris fragilis), whose young leaves and spores contain hydrocyanic acid. The ferns are not eaten by livestock.

References in periodicals archive ?
Cystopteris se caracteriza por incluir plantas graciles esencialmente glabras, con soros circulares e indusios fijos del lado basiscopico, arqueandose sobre el soro, los que comunmente son confluentes a la madurez.
Cystopteris protrusa (Weatherby) Blasdell; Common Fragile Fern, Lowland Bladder Fern; Floodplain forest and north-facing woodland slope; Infrequent; C = 4; BSUH 13230.
La germinacion de esporas en general destaco por su precocidad en la formacion del esporofito para Cheilanthes, formandose antes de 155 dias; en cambio, individuos de los generos Asplenium, Cystopteris y Thelypteris formaron esporofitos entre 155 a 300 dias despues de sembrados.
Finally, the two most common ferns of the older woods are Botrychium virginianum and Cystopteris protrusa.
Para otros generos de la familia Woodsiaceae, Blasdell (1963) y Profumo (1969) mencionan que el gametofito de Cystopteris tiene pelos papilados.
Abundant herbaceous species are Cystopteris protrusa, Cryptotaenia canadensis, Galium spp.
Species from rocky wet habitat Cystopteris fragilis .
douglassii, Circaea lutetiana, Claytonia virginica, Cystopteris protrusa, Dicentra cucullaria, Elymus hystrix, Erigenia bulbosa, Erythronium americanum, Euonymus obovatus, Eupatorium rugosum, Galium concinnum, Geranium maculatum, Geum canadense, Hydrophyllum appendiculatum, H.
Polygonatum odoratum, Polygonatum verticillatum and Prunus avium + in 3; Asplenium trichomanes and Cystopteris fragilis + in 4; Milium effusum and Myosotis sp.