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The Struthiopteris spicant (Blechnaceae, Polypodiopsida) complex in Western Europe, with proposals for taxonomic and nomenclatural changes

A Correction to this article was published on 27 April 2019

This article has been updated

Abstract

Struthiopteris spicant is a medium-sized, dimorphic fern that occurs mainly in Western Europe and Western North America. The species is quite variable, with several forms differing in frond sizes and degree of dimorphism. In addition to the typical plant, in Europe two other varieties are recognized: the Iberian S. s. var. homophyllum includes plants up to 20 cm, monomorphic or subdimorphic, with fragmented cenosori; the Icelandic S. s. var. fallax comprises very small plants up to 5 cm, monomorphic, with isolated sori. Outstanding questions remain about hybridization among the different forms, their taxonomic status, and the relations between different populations. The present work aims to study additional morphological and anatomical features of the S. spicant complex in Western Europe using a statistical approach, to resolve the taxonomic position of the different forms. We observed traits ranging from the rhizome scales to the spores and used one-way ANOVA to test for significant differences between all varieties and PCA to determine whether plants assigned to different varieties can be classified statistically into distinct groups. We detected significant differences in several of the analysed traits among the varieties in the complex. Qualitative differences in pinna anatomy and epidermal cells also help segregation of the varieties considered. Our results allowed us to propose a new specific status for the Icelandic endemic var. fallax and a new endemic Spanish variety, S. s. var. pradae.

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Change history

  • 27 April 2019

    Due to an unfortunate error, the citation of the holotype specimen for the new taxon <Emphasis Type="Italic">Struthiopteris spicant</Emphasis> var. <Emphasis Type="Italic">pradae</Emphasis> is incorrectly stated as MACB 10654, when it should be MACB 110654.

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Acknowledgements

The Universidad Complutense de Madrid partially supported this research through the funding of the research project PR26/16-20295 and a field trip to Iceland (International Mobility Program 2016).

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Correspondence to Jose M. Gabriel y Galán.

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Appendix 1

Appendix 1

List of materials in alphabetical order of taxa, with indication of location, voucher, and number of individuals per voucher.


Struthiopteris fallax (Lange) S. Molino, Gabriel y Galán & Wasowicz.

ICELAND Deildartunguhver, Wasowicz and Gabriel y Galán7 Jul 2016, (MACB 109359) (3 individuals).


Struthiopteris spicant (L.) Weiss var. spicant

AUSTRIA. Salzburg, Hohe Tauern, 20 Jul 1994, Eberwein and Vitek (MA 767022). BELGIUM. Turnhout, Engels Kamp park2, 18 Jun 1973, W. Van Cotthem (MA 809713). FRANCE. Sources Foret de l’Esterel, 01 Aug 1958, G. Gavelle (MA 186653). Serans (Oise), 22 Jul 1921, P. Bosserdet (P 1001059). ICELAND. Vestfirðir, 8 Jul 2016, Gabriel y Galán and Wasowizc (MACB 110659). IRELAND. Iveragh, Caherdaniel, 17 Jul 2016, Molino and Pachón (MACB 109619). NORWAY. Telemark, Nottoden, 15 Aug 2004, P. Sunding (MA 747921). SPAIN. Asturias: Valdés, Luarca, 12 Apr 2017, Gabriel y Galán (MACB 109615) (7 individuals). Canary Islands: Anaga, Tenerife, 25 Oct 1989, Santos (MACB 36152); Anaga, Tenerife, 14 Sep 2017, Gabriel y Galán (MACB 110658) (2 individuals). Cantabria: Camaleño, Cosgaya, 8 Oct 2016, Gabriel y Galán (MACB 109622) (4 individuals). Madrid: Dehesa de Somosierra, 31 May 2017, Gabriel y Galán and Molino (MACB 109611). Zamora: Aciberos, 23 Sep 2017, Molino et al. (MACB 110655). Pontevedra: Monte Aloya, Tuy, 15 Jul 1993, Pajarón and Pangua (MACB 59142). UNITED KINGDOM. South Somerset, Seven Wells Wood, 30 Jul 1968, J.A. Crabbe (MA 195093). Mid Ebudes, Mull, Tobermory, 06 Jul 1970, Crabbe and Jermy (MA 195091).


Struthiopteris spicantvar. homophyllum (Merino) Gabriel y Galán & R.Pino

PORTUGAL. Braga, Vieira do Minho, 1 Oct 2004, Prada (MACB 109621). SPAIN. La Coruña: Santiago, Cantaleta, 29 Jul 1967, Barrera (MACB 32367). Pontevedra: between Tabagón y Tomiño, 19 Mar 2016, Gabriel y Galán (MACB 109617); Mondariz, 20 Mar 2016, Gabriel y Galán (MACB 109618). Salamanca: Batuecas, 15 May 2016, Gabriel y Galán (MACB 109626) (4 individuals).


Struthiopteris spicantvar. pradae S.Molino & Gabriel y Galán

SPAIN. Asturias: Valdés, Paladeperre, 22 Mar 2016, Gabriel y Galán (MACB 109613) (3 individuals); 3 Aug 2016, íbidem (MACB 109615) (3 individuals); Luarca, 26 Jul 2017, Gabriel y Galán (MACB 110660); Otur, 17 Aug 2017, Gabriel y Galán (MACB 110661). Burgos: Sierra de San Millán, 27 Sep 1975, Fuentes (MACB 5994). Salamanca: San Miguel de Valero, 14 May 2016, Gabriel y Galán (MACB 109624) (3 individuals). Zamora: Aciberos, 23 Sep 2017, Molino et al. (MACB 110654).

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Molino, S., Gabriel y Galán, J.M., Wasowicz, P. et al. The Struthiopteris spicant (Blechnaceae, Polypodiopsida) complex in Western Europe, with proposals for taxonomic and nomenclatural changes. Plant Syst Evol 305, 255–268 (2019). https://doi.org/10.1007/s00606-019-1565-0

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Keywords

  • Endemism
  • Morphology
  • Pteridophytes
  • Taxonomy