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Petractis clausa (Zeeëgeltje) in Nederland teruggevonden
A. Aptroot
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2-4
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Petractis clausa found back in the Netherlands. Petractis clausa was thought extinct in the Netherlands. It was previously known from three records, all on ephemeral substrates, such as dead shells and small pebbles of soft limestone. On an excursion to several churchyards of small villages in the Province of Groningen in the extreme northeastern corner of the Netherlands, the species was found at 5 km from the German border on a more stable substrate, viz. an old tombstone.
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Wormmos (Pseudocalliergon trifarium) in trilveen in De Wieden: een arctisch-boreaal-montane mossoort, nieuw voor de Benelux
E.J. Weeda
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5-28
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Pseudocalliergon trifarium, a recent acquisition in a rich fen in NW Overijssel (The Netherlands)
The basiphilous bog pleurocarp Pseudocalliergon trifarium (= Calliergon trifarium) was discovered in a rich-fen site in the large peat-bog reserve ‘De Wieden’ in the northwestern part of the province of Overijssel (between Zwolle en Steenwijk, latitude 52º42´10´´N, longitude 6º07´15´´E). Most specimens throve in a mixture with much Scorpidium scorpioides in a depression dominated by Menyanthes trifoliata. Other companions were Eleocharis quinqueflora (only site in Dutch peat-bog areas!), Scorpidium cossonii, Campylium stellatum, Pedicularis palustris, Comarum palustre, Carex elata and some other Carex species. At a distance of 75 m few specimens of Pseudocalliergon trifarium were found in another depression, growing between Scorpidium cossonii which formed a mosaic with Sphagnum contortum. Grassland species, many of which occur in the immediate surroundings, were virtually absent from the depressions with Pseudocalliergon trifarium. Because the area has thoroughly been investigated with special attention to Scorpidium sites, it is unlikely that Pseudocalliergon trifarium was overlooked so far. Therefore it is considered a new acquisition. Other recent acquisitions to the same moorland region are Philonotis marchica (1974) and Hamatocaulis vernicosus (1996), both now occurring at two sites in the area, while Fissidens osmundoides was found again in 1993 after 130 years of (apparent) absence. These observations may be interpreted as a sign of successful nature management in ‘De Wieden’, which includes control of water quality, bringing base-rich water into the rich-fen sites by means of new-dug trenches, and annual mowing. The appearance of a subarctic species like Pseudocalliergon trifarium in the Dutch lowlands is at variance with the (supposed) trend that mainly southern plant species are spreading nowadays.
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Boomvormig vertakte haarmossen in Nederland: een (her)ontdekking die vooral vragen oproept - een samenvatting
J.D. Kruijer, Chr. Buter, C. Hesse en & B.O. van Zanten
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29-31
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Mosvondsten aan de binnenduinrand op Terschelling en Texel, bij Overveen en Wassenaar
C.J.W. Bruin
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32-51
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Moss finds on the inner dune zone on the isles of Terschelling and Texel, near Overveen and Wassenaar. This paper discusses the finds of a number of more or less rare mosses on the inner dune zones of several dune areas in the Netherlands. The discussed species are moisture demanding mosses or liverworts and, as far as the dunes are concerned (Van Tooren & Bruin, 2004), show a preference for the transition zone from dunes to polders. This habitat differs hydrologically from the “normal” wet or moist dune habitat, the “dune-slack”, in this respect that groundwater fluctuation is much less pronounced here. Also, winter inundation is far less likely, because of the possibility of surface drainage and seepage towards the bordering, lower lying polders on the landward side of the dunes. It appears that in dune areas Rhizomnium pseudopunctatum and Anthoceros punctatus are completely restricted to the inner dune zone, Philonotis fontana and Rhizomnium punctatum nearly so. Other species, e.g. Cratoneuron filicinum and Warnstorfia exannulata, show a strong preference for this habitat, although they may also occur in isolated, and therefore hydrologically more unstable, dune-slacks. Here they usually show a much less vigorous growth than in the seepage areas on the dune fringe. The inner dune zone has in times past largely been cultivated, either for agriculture and afforestation or for building. In recent years attempts have been made in several places along the Dutch dune coast to restore the natural habitat in the dune fringe. Success has been varying a great deal from site to site, depending on the former use of the area and its continuing impact on the succession in the restored sites. Particularly eutrophication of the subsoil proves difficult to eliminate. Even after turf stripping or complete removal of the topsoil the newly arising vegetation shows a mixture of plants from both nutrient poor and rather nutrient rich habitats. Examples may be found in the relevés of tables 1 and 2, that have (except for no’s 1, 8 & 9 in table 1) all been made in recently restored sites in former agricultural fields on the dune fringe. However, after a number of years of further management in the form of hay-cutting and grazing, a more natural vegetation may arise, as shown by the relevés made in the “Vissersplak” on Terschelling, 11 years after its restoration.
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Didymodon ferrugineus (Hakig dubbeltandmos), een nieuwe mossoort voor Nederland
J.G. Colpa & B.O. van Zanten
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52-57
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Didymodon ferrugineus, a moss new to The Netherlands. During an inventory (Nov. 16, 2006) of the cemetery near the Protestant church in the town of Stadskanaal (province of Groningen, The Netherlands) the moss Didymodon ferrugineus (Schimp. ex Besch.) M.O. Hill (syn. Barbula reflexa (Brid.) Brid.) was found growing on marbling of a grave from 1931. Later (Nov. 23) the same species was found on a similar grave of unknown age in the direct vicinity of the first one. Together we found 15 sterile tufts of 1- 4 cm² growing amidst large turfs of Barbula convoluta, with some Barbula unguiculata. The tufts looked healthy and there was no indication of being overgrown by Barbula. This is the first record for The Netherlands. A discussion on the relationship to Didymodon fallax (Hedw.) R.H. Zander is given.
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Behoort Collema auriforme nu tot de Nederlandse licheenflora?
J.L. Spier
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58-60
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Does Collema auriforme now belong to the Dutch lichen flora? Collema auriforme (Wirth.) Coppins & Laundon was found on calcareous rock at a cemetery at Blaricum.
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Excursieverslag van zaterdag 26 februari 2005: dagje Fryslân
J. Koopman & H. Waltje
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61-63
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Bryophytes in two young oak plantations in the province of Fryslân (The Netherlands). An inventory has been made of mosses and liverworts in two rather young (about 30 years) oak plantations. This kind of forests appears to be rich in epiphytic bryophytes. Noteworthy finds are Metzgeria fruticulosa, Porella platyphylla, Antitrichia curtipendula, Cryphaea heteromalla, Orthotrichum acuminatum, Syntrichia papillosa and Ulota phyllantha. Orthotrichum rogeri has been found during a previous excursion. A complete list of epiphytic species is presented.
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Rapporten van inventarisaties van mossen en korstmossen in Nederland (2)
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64-64
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