Saw-dot fern
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Saw potted fern ( Polypodium cambricum ) |
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| Polypodium cambricum | ||||||||||||
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The saw-potted fern ( Polypodium cambricum ) is a species of fern from the order of the potted ferns (Polypodiales) native to the Mediterranean region .
features
The saw-potted fern reaches heights of about 20 to 50 cm. The rhizome has chaff scales 5 to 11 mm long. The leaves die in spring, new leaves are formed in autumn. The leaf margin is cartilaginous and translucent. In the leaf bays it does not reach the median nerve, it is separated from it by green tissue.
The sori are elongated-elliptical. In the sori and sporangia there are branched, glandular threads reminiscent of fungal hyphae . The sporangia have four to seven thick-walled annulus cells.
The number of chromosomes is 2n = 74.
Distribution and locations
The saw-potted fern is native to the Mediterranean region. It only reaches Central Europe in South Tyrol, where it occurs mainly between Salurn and Bolzano , and in southern Switzerland . It grows in crevices in the rock and wall, in South Tyrol in warm climates. It colonizes silicate and carbonate rock. It is mainly limited to the colline altitude level , it rarely rises to the montane level. It occurs in societies of the Polypodion serrati association.
Systematics
One can distinguish the following subspecies:
- Polypodium cambricum L. subsp. cambricum (Syn .: Polypodium australe Fée , Polypodium vulgare var. serratum Willd. , Polypodium serratum (Willd.) F. Saut. , Polypodium cambricum subsp. australe (Fée) Greuter & Burdet , Polypodium cambricum subsp. serrulatum (Arcang.) Pic . Serm. , Polypodium vulgare subsp. Serratum (Willd.) H. Christ ): It occurs in North Africa, South and West Europe, in South Central Europe and in the Middle East.
- Polypodium cambricum subsp. azoricum (Vasc.) E. Nardi (Syn .: Polypodium vulgare subsp. azoricum Vasc. , Polypodium azoricum (Vasc.) R. Fern. , Polypodium australe subsp. azoricum (Vasc.) E. Nardi ): It comes only to the Azores before.
- Polypodium cambricum subsp. macaronesicum (AE Bobrov) Fraser-Jenk. (Syn .: Polypodium macaronesicum A.E. Bobrov ): It occurs in the Canary Islands, Madeira and Spain.
supporting documents
- 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 .
Individual evidence
- ^ Tropicos. [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 .
- ↑ a b c d Christenhusz, M. & Raab-Straube, E. von (2013): Lycopodiophytina. - In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Datasheet Polypodium cambricum In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.
Web links
- Polypodium cambricum L. In: Info Flora , the national data and information center for Swiss flora .
- Distribution in Switzerland [2]
- Distribution in the northern hemisphere (as Polypodium vulgare subsp. Serratum ) from: Eric Hultén, Magnus Fries: Atlas of North European vascular plants. 1986, ISBN 3-87429-263-0 at Den virtuella floran. (swed.)
