Isoetes histrix

Isoetes histrix
Systematics
Subdivision :	Lycopodiophytina
Class :	Bear moss plants (Lycopodiopsida)
Order :	Bream (Isoetales)
Family :	Bream family (Isoetaceae)
Genre :	Bream herbs ( Isoetes )
Type :	Isoetes histrix
Scientific name
	Isoetes histrix
	Bory

Isoetes histrix is a species of the genus of isoetes ( Isoetes ) in the subfamily of Brachsenkrautgewächse (Isoetaceae).

description

Isoetes histrix is a perennial tuber geophyte and its leaves reach heights of 5 to 15 (rarely 35) centimeters. During the summer the plant is leafless and drawn in. The trunk is more or less bulbous and three-lobed. It is covered by permanent, blackish leaf bases that have two stiff tips 3 to 10 millimeters long and a short tip in between. The 10 to 40 upright to protruding leaves , arranged in a rosette, are rush-shaped, 1 to 1.5 millimeters thick with a trapezoidal to pentagonal cross-section, soft, light green and whitish at the base. The transparent edge of the skin, which is strongly narrowed above the sporangia, continues 1 to 2 cm above the leaf base.

The sporangia are located in a pit at the base of the rosette leaves. They are covered by a veil. Micro- and megasporophylls are designed the same. The spherical, 320 to 560 micrometer large macrospores have clear edges and are densely covered with rounded humps. The microspores are 26 to 29 micrometers long, elliptical and densely covered with short spines. The spore ripening period lasts from March to June.

Isoetes histrix is diploid with a chromosome number of 2n = 20.

Occurrence

Isoetes histrix is a Mediterranean-Atlantic floral element. In the Mediterranean area, the range of the species extends from the Iberian Peninsula and the Maghreb eastward to western Anatolia . In Western Europe, where this bream is found along the Atlantic coast of the Iberian Peninsula and France to the Channel Islands, the northernmost occurrences are in Cornwall .

The species grows on winter-wet and sandy or gravelly sites, for example in irrigation ditches or drying ponds, on Crete at altitudes of 50 to 1050 meters.

Systematics

Isoetes histrix was first described in 1844 by the French naturalist Jean Baptiste Bory de Saint-Vincent . Plants brought here as Isoetes histrix var. Subinermis Durieu with missing or only up to 3 millimeter long tips on the leaf bases and a chromosome number of 2n = 22, which are often associated with Isoetes histrix , belong to Isoetes gymnocarpa ( Gennari ) A. Braun .

supporting documents

Ralf Jahn, Peter Schönfelder: Excursion flora for Crete . With contributions by Alfred Mayer and Martin Scheuerer. Eugen Ulmer, Stuttgart (Hohenheim) 1995, ISBN 3-8001-3478-0 , p. 35 .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Carmen Prada: Isoetes. In: Santiago Castroviejo, Manuel Laínz, G. López González, P. Montserrat, Félix Muñoz Garmendia, Jorge Paiva, L. Villar (eds.): Flora Ibérica. Plantas vasculares de la Península Ibérica e Islas Baleares, Vol. I. Lycopodiaceae-Papaveraceae . Real Jardín Botánico, CSIC, Madrid 1986, ISBN 84-00-06222-1 , p. 15-20 ( floraiberica.es [PDF]).
↑ ^a ^b ^c Simonetta Bagella, Lorenzo Peruzzi, Maria Carmela Caria, Rossella Filigheddu: Unraveling the taxonomy and nomenclature of the Isoetes histrix Bory species complex (Isoetaceae, Lycopodiidae). In: Turkish Journal of Botany. Volume 39 (in press), pp. 1-6, doi: 10.3906 / bot-1404-121 .
^ ^A ^b ^c Paul Ascherson, Paul Graebner: Synopsis of the Central European Flora. First volume: Embryophyta zoidiogama. Embryophyta siphonogama (Gymnospermae. Angiospermae [Monocotyledones (Pandanales. Helobiae)]) . 2nd Edition. Wilhelm Engelmann, Leipzig 1913, p. 254 ( online [PDF]).
↑ Werner Greuter , Hervé-Maurice Burdet , Guy Long (eds.): Med-Checklist. A critical inventory of vascular plants of the circum-Mediterranean countries . Vol. 1: Pteridophyta (ed. 2), Gymnospermae, Dicotyledones (Acanthaceae - Cneoraceae) . Conservatoire et Jardin Botanique, Genève 1984, ISBN 2-8277-0151-0 ( online ).
^ AC Jermy: Isoetes. In: Peter Hadland Davis (Ed.): Flora of Turkey and the East Aegean Islands. Vol. 1 (Pteridophyta to Polygalaceae) . Edinburgh University Press, Edinburgh 1965, ISBN 0-85224-159-3 , pp. 37-38 (reprinted 1997).
↑ Jaakko Jalas, Juha Suominen (ed.): Atlas Florae Europaeae. Distribution of Vascular Plants in Europe. 1: Pteridophyta (Psilotaceae to Azollaceae). Akateeminen Kirjakaupa, The Committee for Mapping the Flora of Europe & Societas Biologica Fennica Vanamo, Helsinki 1972, p. 31.
^ Jean Baptiste Bory de Saint-Vincent: Sur les Isoëtes et les espèces nouvelles de cette famille découvertes en Algérie. In: Comptes rendus hebdomadaires des séances de l'Académie des Sciences. Volume 18, 1844, pp. 1163–1168 (here: p. 1167; digital copy ).

Web links

[FlIberica-1] ↑ ^a ^b ^c ^d ^e ^f ^g Carmen Prada: Isoetes. In: Santiago Castroviejo, Manuel Laínz, G. López González, P. Montserrat, Félix Muñoz Garmendia, Jorge Paiva, L. Villar (eds.): Flora Ibérica. Plantas vasculares de la Península Ibérica e Islas Baleares, Vol. I. Lycopodiaceae-Papaveraceae . Real Jardín Botánico, CSIC, Madrid 1986, ISBN 84-00-06222-1 , p. 15-20 ( floraiberica.es [PDF]).

[Bagella+al2014-2] Simonetta Bagella, Lorenzo Peruzzi, Maria Carmela Caria, Rossella Filigheddu: Unraveling the taxonomy and nomenclature of the Isoetes histrix Bory species complex (Isoetaceae, Lycopodiidae). In: Turkish Journal of Botany. Volume 39 (in press), pp. 1-6, doi: 10.3906 / bot-1404-121 .

[AschGr-3] A ^b ^c Paul Ascherson, Paul Graebner: Synopsis of the Central European Flora. First volume: Embryophyta zoidiogama. Embryophyta siphonogama (Gymnospermae. Angiospermae [Monocotyledones (Pandanales. Helobiae)]) . 2nd Edition. Wilhelm Engelmann, Leipzig 1913, p. 254 ( online [PDF]).

[MCh1-4] Werner Greuter , Hervé-Maurice Burdet , Guy Long (eds.): Med-Checklist. A critical inventory of vascular plants of the circum-Mediterranean countries . Vol. 1: Pteridophyta (ed. 2), Gymnospermae, Dicotyledones (Acanthaceae - Cneoraceae) . Conservatoire et Jardin Botanique, Genève 1984, ISBN 2-8277-0151-0 ( online ).

[FT1-5] AC Jermy: Isoetes. In: Peter Hadland Davis (Ed.): Flora of Turkey and the East Aegean Islands. Vol. 1 (Pteridophyta to Polygalaceae) . Edinburgh University Press, Edinburgh 1965, ISBN 0-85224-159-3 , pp. 37-38 (reprinted 1997).

[AFE1-6] Jaakko Jalas, Juha Suominen (ed.): Atlas Florae Europaeae. Distribution of Vascular Plants in Europe. 1: Pteridophyta (Psilotaceae to Azollaceae). Akateeminen Kirjakaupa, The Committee for Mapping the Flora of Europe & Societas Biologica Fennica Vanamo, Helsinki 1972, p. 31.

[Bory1844-7] Jean Baptiste Bory de Saint-Vincent: Sur les Isoëtes et les espèces nouvelles de cette famille découvertes en Algérie. In: Comptes rendus hebdomadaires des séances de l'Académie des Sciences. Volume 18, 1844, pp. 1163–1168 (here: p. 1167; digital copy ).