Middle potted fern

Middle potted fern
	Middle potted fern ( Polypodium interjectum )
Systematics
	Ferns
Class :	True ferns (Polypodiopsida)
Order :	Spotted ferns (Polypodiales)
Family :	Potted fern family (Polypodiaceae)
Genre :	Potted ferns ( Polypodium )
Type :	Middle potted fern
Scientific name
	Polypodium interjectum
	Shivas

The middle spotted fern ( Polypodium interjectum ) is a fern species native to Central Europe from the order of the spotted ferns (Polypodiales).

features

Sori of the middle potted fern

The middle potted fern reaches heights of 20 to 40 cm. The rhizome bears 6 to 7 mm long, oval lanceolate chaff scales.

The feathers are pointed, the bay between the leaflets usually has no cartilage connection with the midrib. The lateral nerves of the lowest pinnate lobes are mostly bifurcated three to four times.

The sori are often oval. The sporangia have six to ten thick-walled annulus cells and two to five unthickened basal cells.

The species is hexaploid , it is allopolyploid from the tetraploid Polypodium vulgare and the diploid Polypodium cambricum . The chromosome number is 2n = 222.

Distribution and locations

The middle potted fern occurs all over Central Europe, but is rather rare. The exact distribution is insufficiently known. It grows on shady rocks, mainly on limestone and dolomite. The distribution area includes Madeira, Portugal, Spain, the Balearic Islands, France, Corsica, Sardinia, Sicily, Italy, Germany, Great Britain, Ireland, Belgium, Luxembourg, the Netherlands, Denmark, Norway, Sweden, Switzerland, Austria, Hungary, the Czech Republic, Slovakia, Slovenia, Romania, Ukraine and Russia.

Taxonomy

To Polypodium interjectum Shiva exists synonym Polypodium vulgare subsp. prionodes (Ash.) Rothm.

Web links

Commons : Mittlerer Tüpfelfarn ( Polypodium interjectum ) - Collection of images, videos and audio files

Middle potted fern. In: FloraWeb.de.
Middle potted fern . In: BiolFlor, the database of biological-ecological characteristics of the flora of Germany.
Profile and distribution map for Bavaria . In: Botanical Information Hub of Bavaria .
Distribution in Switzerland [1]
Thomas Meyer: Tüpfelfarn data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
photos

literature

Manfred A. Fischer , Karl Oswald, Wolfgang Adler: Excursion flora for Austria, Liechtenstein and South Tyrol. 3rd, improved edition. State of Upper Austria, Biology Center of the Upper Austrian State Museums, Linz 2008, ISBN 978-3-85474-187-9 .
Siegmund Seybold (Ed.): Schmeil-Fitschen interactive (CD-Rom), Quelle & Meyer, Wiebelsheim 2001/2002, ISBN 3-494-01327-6

Individual evidence

^ Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp. 87 .
↑ M. Christenhusz & E. von Raab-Straube (2013): Polypodiopsida. Datasheet Polypodium In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.

[Oberdorfer2001-1] Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp. 87 .

[Euro+Med-2] M. Christenhusz & E. von Raab-Straube (2013): Polypodiopsida. Datasheet Polypodium In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.