Dryopteris pseudodisjuncta

Dryopteris pseudodisjuncta (Tavel ex Fraser-Jenkins) Fraser-Jenkins. Esch-sur-Sûre. © by Yves Krippel.Dryopteris pseudodisjuncta (Tavel ex Fraser-Jenkins) Fraser-Jenkins

EnglishElegant Scaly Male-fern
FrançaisDryoptéris élégant 
DeutschEleganter Schuppen-Wurmfarn
LëtzebuergeschElegante Schuppe-Wuermfar
Class: Pteridopsida
Family: Dryopteridaceae

Status

DD – Data Deficient

Dryopteris pseudodisjuncta

Further information

Syn.: Dryopteris affinis (Lowe) Fraser-Jenkins subsp. pseudodisjuncta (Tavel ex Fraser-Jenkins) Fraser-Jenkins

Adiantum aleuticum

Adiantum aleuticum (Rupr.) C.A.Paris (Pteridaceae). Ettelbruck (L). © 2022 by Yves Krippel.Adiantum aleuticum (Rupr.) C.A.Paris
EnglishWestern Maidenhair Fern
FrançaisAdiante des Aléoutiennes
DeutschWestlicher Frauenhaarfarn
LëtzebuergeschAleuten-Fraenhoerfar
Class: Pteridopsida
Family: Pteridaceae

Status

R – extremely rare

Description

Adiantum aleuticum – member of the Adiantum pedatum complex – was observed, on the 21th of June 2022, in a wall at Ettelbruck. To our knowledge, this is the first documented naturalized occurrence in Luxembourg of this garden escaped fern. 

Further information

Krippel, Y., G. Gallego, S. Hermant & G. Colling, 2023. Another garden escaped fern in Luxembourg – Adiantum aleuticum (Rupr.) C.A.Paris (Pteridaceae). Bulletin de la Société des naturalistes luxembourgeois 125: 113–118.

Dryopteris × critica

Dryopteris x critica Fraser-Jenkins (Dryopteridaceae). hb.Mnhn - LUX19109 - leg. Reichling 1952, det. Fraser-Jenkins 1987 . © 2009 by Yves Krippel.
EnglishD. borreri × D. filix-mas
Françaisn/a
Deutschn/a
LëtzebuergeschKritesche Wuermfar
Class: Pteridopsida
Family: Dryopteridaceae

Status

R – extremely rare

Map of Dryopteris x critica

Further information

Syn: D. ×complexa nothosubsp. critica Fraser-Jenk.

Exact information on the distribution of the hybrids Dryopteris affinis agg. × Dryopteris filix-mas in Luxembourg is lacking. The Herbarium of the National Natural History Museum of Luxembourg contains two Dryopteris specimens collected by L. Reichling in 1952 (LUX 19101, LUX 19109), considered as Dryopteris ×complexa Fraser-Jenkins nothosubsp. critica Fraser-Jenkins ( = Dryopteris affinis subsp. borreri × Dryopteris filix-mas), det. Fraser-Jenkins 27.8.1987. 

See also: Krippel, Y., W. Bujnoch & G. Zenner, 2009. – Nachweise diploider und triploider Sippen aus dem Dryopteris affinis-Aggregat und einer Hybride mit Dryopteris filix-mas (Dryopteridaceae, Pteridophyta) im Gebiet der Obersauer (Luxemburg). – Bull. Soc. Nat. luxemb. 110: 43-52.

Cyrtomium fortunei

Cyrtomium fortunei J. Smith (Dryopteridaceae). Esch-sur-Sûre (L). © 2020 by Yves Krippel.Cyrtomium fortunei J. Smith
EnglishFortune’s Holly-fern
FrançaisCyrtomium de Fortune
DeutschOstasiatischer Sichelfarn
LëtzebuergeschFortune-Séchelfar
Class: Pteridopsida
Family: Dryopteridaceae

Status

R – extremely rare

Description

Cyrtomium fortunei var. clivicola – first erroneously identified as Cyrtomium falcatum – was observed, on the 4th of July 2020, by Jo Goergen and Patrick Thommes in a ditch near Esch-sur-Sûre. To our knowledge, this is the first documented naturalized occurrence in Luxembourg of this popular garden fern. 

Further information

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

Diphasiastrum complanatum

Diphasiastrum complanatum (L.) Holub [extr. herb. Kotz]Diphasiastrum complanatum (L.) Holub
EnglishNorthern Ground-Cedar
FrançaisLycopode aplati
DeutschGewöhnlicher  Flachbärlapp
LëtzebuergeschFlaacht Hexemoos
Class: Lycopodiopsida
Family: Lycopodiaceae

Status

RE – regionally extinct

Description

Diphasiastrum complanatum sensu lato was observed in four locations; the only certified location for Diphasiastrum complanatum (L.) Holub s. str. is in the north-west of Luxembourg, where the Running-pine was observed in the 19th century by Koltz in a wood between Rambrouch and Arsdorf.

Further information

Krippel, Y. & J. A. Massard, 2019. – Les lycopodes (Lycopodiaceae) au Luxembourg – notes chorologiques et liste rouge. – Bull. Soc. Nat. luxemb. 121: 53-69.

Trichomanes speciosum

Trichomanes speciosum Willd. (Hymenophyllaceae). Beaufort (L). © 2002 by Yves Krippel.Trichomanes speciosum Willd.
EnglishKillarney fern
FrançaisTrichomanès remarquable
DeutschPrächtiger Dünnfarn
LëtzebuergeschAparten Hautfar
Class: Pteridopsida
Family: Hymenophyllaceae

Status

LRlc – lower risk least concern

Distribution map of Trichomanes speciosum (gametophytes)

Description

Trichomanes speciosum sporophyteAlthough primarily a species of the UK, Ireland, Brittany and the Atlantic Islands (Canaries, Madeira and the Azores), the filmy ferm Trichomanes speciosum Willd. (Killarney fern) [Photo 1] is also found in Europe at scattered locations in other parts of France, Spain, Portugal and Italy.

The gametophytic generation of Trichomanes speciosum Willd. [Photo 2] (Syn.: Vandenboschia speciosa) can be found independently of the sporophyte and seems to be widespread in Europe – in contrast to the sporophyte. It appears however to exist in a state of arrested development, unable to produce the mature form under present conditions.

Trichomanes speciosum Willd. is listed on Annexes II and IV of the Habitats Directive and Appendix I of the Bern Convention. It is listed as rare on the IUCN global RDL.

Trichomanes speciosum gametophyteIn Luxembourg the independent gametophyte of Trichomanes speciosum was first discovered in 1993 [Jermy, Rasbach, Rasbach & Viane (unpubl.)]. In 1994 some new locations were found [Colling, G. & L. Reichling, 1996. – Notes floristiques 1994-1995. – Bull. Soc. Nat. luxemb., 97: 25-38]. So, in late 1999 a project was launched, to investigate the sandstone region, commonly called ‘Petite Suisse’, in Luxembourg in order to fix the distribution area of the gametophyte. Many new locations of the gametophyte were found. Most of the sites occur in the ‘Petite Suisse’ area, but the independent gametophyte of Trichomanes speciosum is largely present in the whole sandstone area as far as the valley of the river Alzette. The discoveries of the gametophyte on Devonian schist showed that the species is quite widespread in the Luxembourg’s Ardennes too.

The results of the different investigations, with a description of the gametophyte, the history of its discovery, the present distribution and status in Luxembourg and the neighbouring regions can be found in following publications:

  • Krippel, Y., 2001. Aire de répartition et statut de Trichomanes speciosum Willd. (Hymenophyllaceae) au Luxembourg. Bull. Soc. Nat. luxemb. 102: 3-13. [PDF 551 Kb]
  • Krippel, Y., 2005. – The Hymenophyllaceae (Pteridophyta) in Luxembourg – Past, present and future. – In: Ries C. & Y. Krippel (Editors), 2005. – Sandstone Landscapes in Europe – Past, Present and Future. Proceedings of the 2nd International Conference on Sandstone Landscapes. Vianden (Luxembourg) 25-28.05.2005. – Ferrantia. Trav. Scientif. Mus. Hist. Nat. Lux. 44: 209-214.
  • Krippel, Y., 2009. – Trichomanes speciosum Willd. (Hymenophyllaceae) au G.-D. de Luxembourg, en Belgique et dans les régions avoisinantes. – Adoxa, 61: 9-13.

At present date (10/2020), more than 180 sites in 100 different square kilometres are known.

Further information

Syn.: Vandenboschia speciosa (Willd.) G. Kunkel

Pteridium aquilinum

Pteridium aquilinum (L.) Kuhn (Dennstaedtiacea). Finsterthal (L). © 2000 by Yves Krippel.Pteridium aquilinum (L.) Kuhn
EnglishBracken
FrançaisFougère-aigle
DeutschAdlerfarn
LëtzebuergeschAadlerfar
Class: Pteridopsida
Family: Dennstaedtiaceae

Status

* – not threatened

Pteridium aquilinum

Polystichum × bicknellii

Polystichum x bicknellii (Christ) Hahne (Dryopteridaceae). Saueruecht (L). © 1952 by Léopold Reichling.Polystichum × bicknellii (Christ) Hahne
EnglishLowland Hybrid Shield-fern
Françaisn/a
Deutschn/a
LëtzebuergeschBicknell-Schëldfar
Class: Pteridopsida
Family: Dryopteridaceae

Status

R – extremely rare

Polystichum setiferum

Polystichum setiferum (Forssk.) Woynar (Dryopteridaceae). Beaufort (L). © 2002 by Yves Krippel.Polystichum setiferum (Forssk.) Woynar
EnglishSoft Shield-fern
FrançaisPolystic à soies
DeutschBorstiger Schildfarn
LëtzebuergeschBuuschtege Schëldfar
Class: Pteridopsida
Family: Dryopteridaceae

Status

R – extremely rare

Polystichum setiferum