Author: Yves Krippel

Azolla filiculoides Lam.
Water Fern
Azolle commune
Großer Algenfarn
Groussen Algefar
Class: Polypodiopsida
Family: Salviniaceae

Status

R – extremely rare

Further information

Azolla filiculoides often occurs in ponds, … in private gardens, where it is regularly introduced with other water plants. Azolla filiculoides was however recently found in 3 ponds situated in the open countryside, near the village of Bourscheid (10.7.2009, K.-G. Gessner; 30.7.2009, K.G. Gessner, Y. Krippel & P. Thommes) and can be considered as naturalized.

For more details:
Krippel, Y. & P. Thommes, 2021. Cyrtomium fortunei J. Sm. (Dryopteridaceae) and other garden escaped ferns in Luxembourg. Bull. Soc. Nat. luxemb. 123: 21-28..

More information about Azolla filiculoides in the region can be found in:
Muller, S., 2006. Prolifération spectaculaire d’Azolla filiculoides (Azollaceae, Pteridophyta) dans le canal de Jouy près de Metz (Lorraine, France) à l’automne 2005. Bull. Soc. Nat. luxemb. 107: 31-38. [PDF 828 Kb]

Athyrium filix-femina (L.) Roth
Woodland Lady-fern
Fougère femelle
Wald-Frauenfarn
Fraefar
Class: Polypodiopsida
Family: Woodsiaceae

Status

* – not threatened

Asplenium × murbeckii Dörfler
Murbeck’s Spleenwort
Asplénie de Murbeck
Schwäbischer Streifenfarn
Murbeck-Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

CR – critically endangered

No picture available
Asplenium × dolosum Milde
A. adiantum-nigrum × A. trichomanes ssp. tr.
n/a
n/a
n/a
Class: Polypodiopsida
Family: Aspleniaceae

Status

DD – data deficient

Description

 Asplenium × dolosum Milde is the hybrid between A. adiantum-nigrum × A. trichomanes ssp. trichomanes.

In fact, Lawalrée (in : Lawalrée A., 1951. – Les ptéridophytes du Grand-Duché de Luxembourg. Bull. Soc. roy. Bot. Belg. 83: 225-240.) describes a new taxon for Luxembourg, i.e. “X Asplenium Reichlingii Lawalrée hybr. nov.” (= A. adiantum-nigrum x A. trichomanes), discovered on the 13 June 1950 by Léopold Reichling in the Luxembourgish Ardennes; hybrid later known as Asplenium × dolosum. Unfortunately, the fern collected near the Moulin de Bourscheid turned out to be just a monstrous form of Asplenium trichomanes.

Asplenium × alternifolium Wulfen
Alternate-leaved Spleenwort
Doradille à feuilles alternes
Deutscher Streifenfarn
Däitsche Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

EN – endangered

Description

Asplenium × alternifolium is the hybrid between Asplenium septentrionale and A. trichomanes subsp. trichomanes.

Further information

Asplenium × alternifolium can be found in regions where Asplenium septentrionale is abundant.

Asplenium viride Huds.
Green Spleenwort
Doradille verte
Grüner Streifenfarn
Grénge Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

RE – regionally extinct

Asplenium trichomanes L. subsp. trichomanes
Delicate Maidenhair Spleenwort
Doradille polytric
Silikatliebender Brauner Streifenfarn
Delikate Brongstillege Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

* – not threatened

No map available.

Asplenium trichomanes L. subsp. quadrivalens D.E. Mey.
Common Maidenhair Spleenwort
Capillaire commune
Gewöhnlicher Brauner Streifenfarn
Gewéinleche Brongstillege Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

* – not threatened

No map available.

Asplenium trichomanes L. nothossp. staufferi Lovis & Reichstein
A. t. ssp. quadrivalens × ssp. pachyrachis
n/a
n/a
Dem Stauffer säi Brongstillege Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

R – extremely rare

Description

Asplenium trichomanes subsp. pachyrachis can hybridise with subsp. quadrivalens, forming a vigorous plant with a more upright habit than subsp. pachyrachis and distinctly intermediate between the parents. It is known as Asplenium trichomanes L. nothossp. staufferi Lovis & Reichstein.

A rapid investigation of natural sandstone outcrops, buildings, walls, … showed that Asplenium trichomanes nothossp. staufferi is easily found in areas where the two parents are present and grows on natural rocks as well as on man-made walls. At present date, 23 sites in 17 square kilometres are known.

The results of the investigation and the present distribution and status in Luxembourg can be found in:

Krippel, Y., 2003. – Aire de répartition et statut d’Asplenium trichomanes L. nothossp. staufferi Lovis & Reichstein (Aspleniaceae, Pteridophyta) au Luxembourg. – Bull. Soc. Nat. luxemb. 104: 3-12.

Asplenium obovatum subsp. billotii (F.W. Schultz) Kerguélen
Lanceolate Spleenwort
Doradille de Billot
Lanzettblättriger Streifenfarn
Lanzett-Sträifefar
Class: Polypodiopsida
Family: Aspleniaceae

Status

RE – regionally extinct