Juncus subnodulosus

Abstract: As a result of nature management measures a number of rare and endangered species reappeared, often after many decades of absence on the site: Apium inundatum, Anagallis tenella, Cicendia filiformis, Echinodorus repens, Eleocharis quinqueflora, Juncus tenageia, Ludwigia palustris, Myriophyllum alterniflorum, Pilularia globulifera and Viola persicifolia; the latest news (summer 1997) being the rediscovery of the presumably extinct Juncus capitatus. New are the alien species Nonea lutea, Salix udensis, and Typha minima. Field botanists are urged to collect more herbarium material and to improve the quality of their collections.

Abstract: Blunt-flowered rush Juncus subnodulosus Schrank (J. obtusifolius) Compact rush J. conglomeratus L. (J. communis var conglomeratus) Hard rush J. inflexus L. (wire rush) (J. glaucus) Heath rush J. squarrosus L. Jointed rush J. articulatus L. (shining-fruited rush) (J.lampocarpus) Slender rush J. tenuis (North American rush) (J. macer) Sharp-flowered rush J. acutiflorus Ehrh. Ex Hoffm. (J. sylvaticus) Soft rush J. effusus L. (common rush) (J. communis var. effusus) Toad rush J. bufonius L. (frog grass, saltweed) (J. minutulus)

Abstract: In 1987 the moss Ctenidium molluscum was found at three sites in a small secondary dune-slack on the island of Texel. Outside the area of limestone grasslands in the south of Limburg this species is very rare in the Netherlands. The vegetation in which it was found is dominated by Schoenus nigricans and Juncus subnodulosus, while in the moss-layer Calliergonella cuspidata, Fissidens adianthoides and Campylium stellatum occur frequently. This vegetation can best be regarded as a fragmentary example of the Schoeno-Juncetum subnodulosi Allorge 1922, a community of calcareous mires. From 1982 onwards the vegetation is mown annually, under the influence of which it is still changing. Every year ‘new’ species can be recorded at the site. In the past two years amongst others Oenanthe lachenalii, Samolus valerandi and Taraxacum palustre were discovered as newcomers. In the Netherlands these species are mainly restricted to brackish areas near the sea-coast, like young dune-slacks and salt-marshes. Outside the Netherlands they may also be found in areas with purely fresh water, e.g. in the Schoeno-Juncetum subnodulosi. The same is true for Carex distans. It is suggested the occurrence of these plants (none of which is a true halophyte) in brackish environment should not be ascribed to the salt-content of the soil but to the fact that such brackish sites are also quite base-rich.