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De Gasterse Duinen
B.O. van Zanten, W.J. de Ruiter, E. de Haas-Lely & E.H. Rietsema
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3-9
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The Gasterse Duinen
The Gasterse Duinen, a nature reserve in the province of Drenthe, the Netherlands. The reserve of ca. 75 ha in the North of the province of Drenthe between Assen and Zuidlaren, is investigated bryologically. The area consists of a hilly, grassy heath land with some small peat bogs and small woods (mainly pine, oak and birch). A total of 82 mosses and 25 liverworts were found. The most interesting finds are Leptodontium gemmascens (first record for The Netherlands), Orthotrichum obtusifolium (first record for the North of The Netherlands) and richly fruiting Scapania compacta, a species strongly in decline, especially fruiting specimens. Tortella inclinata was found on cement tiles of a roof of a nearby house. This is the second locality of this species in the North of The Netherlands.
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Het Gasterse Holt
B.O. van Zanten, W.J. de Ruiter, E. de Haas-Lely & E.H. Rietsema
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10-19
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The Gasterse Holt
The Gasterse Holt, a small wood in the province of Drenthe, the Netherlands. This paper deals with the moss flora of a small wood in the north of the Province of Drenthe, named Gasterse Holt. The wood is relatively rich in species owing to an impervious layer of loam called "potklei", a fluvial-glacial deposit. A comparison is made with former surveys by Barkman (1971) and de Vries & van Huffelen (1981). A total of 77 species were found during our survey, whereas Barkman mentions 37 species (however without the ditch, loc. 5) and de Vries & van Huffelen 71 species. The disappearance of a number of acidophilous species (loc. 4) is due to the cultivation of a small heath land. Due to a demineralisation management since the early nineties some acidophilous species (re)appeared in this locality (viz. Aulacomnium palustre, Dicranum scoparium, Sphagnum denticulatum, S. molle and S. palustre). Also some forest species (loc. 1a, 2a) are strongly in decline without any notable reason, viz: Leucobryum glaucum, Rhizomnium punctatum and Chiloscyphus polyanthos. Some of the pioneer species found earlier in the talus of a ditch (loc. 5) were not recollected because of the initially high water level in the ditch and later their evident absence is probably due to the abundance of grasses.
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Zeldzame mossoorten vs. blinde floristiek
C.G. Buter
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20-25
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Rare bryophytes and “blind floristics”. The male thallus of Blasia pusilla is described in detail. A drawing and picture are provided as well. The designation “blind floristics” is coined for surveys aimed at recording species only without having an eye for unusual ecological and morphological features of the species. Such as male thalli of Blasia. An unexpected discovery of Polytrichum alpinum in a polder within the Biesbosch-area (at sea level!) is another example.
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Nieuwe en interessante korstmossen en korstmosparasieten in Nederland met aanvulling en wijzigingen op de checklist
L.B. Sparrius, A. Aptroot, C.M. van Herk & A.M. Brand
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26-46
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New or interesting lichens and lichenicolous fungi in the Netherlands with additions and changes to the checklist. Only a short period after the publication of a new lichen checklist of the Netherlands, the authors present details on additional lichens and lichenicolous fungi reported here as new to the Netherlands: Aspicilia cupreogrisea, Bacidia inundata, Bacidia trachona, Caloplaca alstrupii (the second locality in the world), Laeviomyces pertusariicola, Lecanora leuckertiana, Lichenochora verrucicola, Lichenoconium xanthoriae, Lichenostigma elongata, Opegrapha areniseda, Paranectria oropensis, Polycoccum pulvinatum, Strigula taylorii, Thelocarpon strasseri and Unguiculariopsis groenlandiae. Additional records of rare lichen species or species which were thought to be extinct and references to new species reported elsewhere are also provided. A list of 53 taxa additional to the checklist is presented. Lichenochora verrucicola and Lichenostigma elongata were both repeatedly found on Aspicilia leprosescens, which is a new host species for both taxa. Paranectria oropensis was never reported before with Candelariella reflexa as a host.
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Opmerkelijke facies van korstmossen op het spoorwegemplacement bij NS-station Nijmegen-Heijendaal
R. Ketner-Oostra & A.A.M. de Goeij
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47-53
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Remarkable facies of lichens on a railway yard in the city of Nijmegen. In 1999 a lichen-rich grassland on a railway yard inside the town of Nijmegen (eastern part of the Netherlands) was studied. The area consisted of Pleistocene sands and was in the past excavated and leveled on the low end of a lateral moraine. It was found that the pseudo-reindeer lichens Cladonia furcata and C. rangiformis had formed to 8 cm high mats and filled in between the grass pattern, mainly consisting of Festuca rubra ssp. commutata. Inside this pattern Cladonia ramulosa, C. subulata and C. merochlorophaea were also well-developed. This lichen facies was assigned to the plant community Plantagini-Festucion, a part of the Koelerio-Corynephoretea. Development of such facies might have taken 10-20 years and could be connected with the mineral-poor substratum in this approximately 10 m deep excavated valley. Moreover the microclimate of high air moisture and the inaccessiblility for the public are thought to be important environmental factors.
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Nieuws over de website: www.blwg.nl
L.B. Sparrius
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54-55
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Lindbergia-nieuws
H.J. During
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55-56
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