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Verslag van de korstmossenexcursie naat het zuidwesten van Friesland
L.B. Sparrius, A. Aptroot & C.M. van Herk
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3-8
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Report of a lichenological excursion to the southwest of the province of Friesland (the Netherlands). On June 13, 1999 a lichenological excursion was made to the western part of the province of Friesland. Interesting species are Ramalina lacera and Schismatomma decolorans growing on a church wall. Both species occur rarely on rock in the Netherlands. A few recently described epiphytes, Lecanora barkmaniana and Lecanora compallens, are fairly common in this part of the country. A neglected member of the Parmelia subrudecta-group, P. ulophylla, could be separated from P. subrudecta s.s easily. Both species were growing side by side. A revision on this group will appear in the Lichenologist (Van Herk & Aptroot, in press). Sea-dikes with basalt and granite rock were examined, with interesting species like Aspicilia leprosescens, Caloplaca britannica, C. microthallina, C. marina and Diplotomma chlorophaeum.
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Korstmossen in zuidoost Groningen, najaarsweekend 1999
A. Aptroot, C.M. van Herk, L.B. Sparrius & A.M. Brand
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9-16
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Lichens in southeast Groningen (the Netherlands), field meeting autumn 1999. The lichens of southeast Groningen (close to the German border) have been investigated in autumn 1999. 184 lichens and lichenicolous fungi were found. Absconditella trivialis Vězda is reported for the first time from the Netherlands.
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De mossen van de Groninger waddeneilanden
J.D. Kruijer, K. Koops, M. Edelenbos, R. Ubels, D. Lutterop, G. Kasemir & B. Corté
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17-31
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The mosses of the Wadden Sea islands Rottumerplaat, Rottumeroog and Zuiderduin (the Netherlands, province of Groningen) Rottumerplaat, Rottumeroog, and Zuiderduin are three small barrier islands in the Dutch part of the Wadden Sea. Rottumerplaat is the largest and is still becoming larger. It is relatively young and came into existence as a sandbank in the nineteenth century. Since 1950, it can be considered a true island. Rottumeroog is the oldest one. Since the sixteenth century, it is moving eastwards and, simultaneously, it is becoming smaller. Zuiderduin is the smallest and the youngest of the islands. Since it separated from Rottumeroog in c. 1930, it is rapidly moving southeastwards. In 1999, an inventory was made of the bryoflora of these islands as part of a monitoring project of the island flora, which since 1996 is carried out by Staatsbosbeheer regio Groningen - Drenthe. This paper presents the recent findings and is supplemented with a historic overview of earlier records of bryophytes for Rottumerplaat and Rottumeroog; the bryoflora of Zuiderduin was previously unknown. The inventory resulted in a list of 34 bryophyte species on Rottumerplaat, 24 species on Rottumeroog, and 8 species on Zuiderduin. During the last c. 25 years, the number of species on Rottumerplaat has increased by 12 species, whereas the number of species on Rottumeroog has decreased by 16 species. The most interesting new species on Rottumerplaat are Dicranum scoparium, Pleurozium schreberi, Rhytidiadelphus triquetrus, Homalothecium lutescens and Orthotrichum cupulatum (1 tiny specimen; new for the Dutch Wadden Sea-area). D. scoparium is also new for Rottumeroog. R. triquetrus was found on this island in 1869 and has never been found since until 1999. The bryologically most interesting site on Rottumeroog (“tuin van Toxopeus”) has disappeared by floods in 1998–1999 together with, amongst others, the rare species Moerckia hibernica en Bryum calophyllum.
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Korstmossen op oude kerken in Nederland
L.B. Sparrius
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32-36
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Lichens on old churches in the Netherlands
In 1999, a survey has made about lichens growing on walls of 121 churches in the Netherlands. 173 species have been found, including 10 red listed species. The number of species per church varies from 10 tot 77. Especially walls of volcanic tuff and soft limestone are very valuable for the lichen flora, in this country, where natural rock is absent. Some species show a distribution pattern according to the distribution of these building materials. Lists of characteristic species, common species, best’ churches and literature are provided.
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Excursie naar de duinen bij Wassenaar, met de terrestrische vindplaats van Usnea articulata en twee nieuwe parasieten op Peltigera
A. Aptroot, C.M. van Herk, L.B. Sparrius & J.L. Spier
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37-40
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A field trip to the dunes near Wassenaar, with the terrestrial occurrence of Usnea articulata and two new parasites on Peltigera. In the coastal dune area near Wassenaar the ancient terrestrial locality of Usnea articulata was visited and the species was found to be in reasonably good shape, with four populations, two of which were newly found. Two lichenicolous fungi found on Peltigera proved to be new to the Netherlands: Polycoccum crassum and Pseudorobillarda peltigerae, the latter of which was so far only known from the holotype from Belgium.
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Eurhynchium angustirete (Broth.) T. Kop (Grof snavelmos) in Nederland
P. Bremer
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41-46
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Eurhynchium angustirete (Broth.) Kop. in the Netherlands. Eurhychium angustirete is very rare in the Netherlands. Since 1982 it has been found at 13 locations; 78% in the plantations of the IJsselmeerpolders. In the polders Eurhynchium angustirete prefers trenchsides, woodfloor and treefeet within plantations of Fraxinus excelsior, on boulderclay or (medium) fine sand. As Eurhynchium angustirete is always sterile, establishment always has taken place with spores from abroad. After establishment patches grew larger by vegatative spread. In 1999 most of the patches in the polders had disappeared by various causes. On pleistocene sands Eurhynchium angustirete has recently been found at some plantations of Pseudotsuga menziesii.
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Heterodermia obscurata nieuw voor Nederland
D.W. Wolfskeel & C.M. van Herk
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47-50
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Heterodermia obscurata, new for the Netherlands
Heterodermia obscurata (Nyl.) Trevisan was found by the first author on an ash tree (Fraxinus) at the borders of the city of Utrecht. This record concerns a new species as well as a new macrolichen genus for the Netherlands.
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Lichenologische excursie naar de Lemelerberg op 2 april 2000
A. Aptroot, C.M. van Herk, L.B. Sparrius & J.L. Spier
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51-56
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Lichenological excursion to the Lemelerberg near Ommen in the province of Overijssel (the Netherlands). This region, consisting of drift sand, Calluna heath and Juniperus communis with detached Quercus, Betula and Pinus, is well-known for its richness in Cladonia species. Although things are changing, still twenty-one terrestrial Cladonia species have been found. Some sample plots have been investigated to embody the present situation for the future. The area is one of the last strongholds of Cetraria islandica in the Netherlands! Juniperus communis has been examined thoroughly, which resulted in a list of eighteen species including Melaspilea proximella Nyl. ex Norrlin of which the status is not yet clear. There is a possibility that this species is a facultative lichenicolous fungus on Lecanora barkmaniana. New to the Netherlands is the lichenicolous fungus Lichenoconium xanthoriae M.S. Christ, found on Xanthoria polycarpa. The "Dikke Steen", an erratic boulder north of the Lemelerberg, has been investigated and revealed such lichens as Fuscidea praeruptorum, Micarea leprosula, M. lignaria and Porpidia tuberculosa. Several churches have been visited on the way, which among other things resulted in Dirina stenhammari, Lecanora pannonica and L. sulphurea.
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Erratum: Kortselius, M.J.H. 2000. Mossenexcursie Coepelduynen op 18 december 1999. Buxbaumiella 51: 8-11
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56-56
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Verslag inventarisatie mossen Natuurvriendelijke Oever Spaarnwoude in 1998 en 1999
B.W.J.M. Kruijsen
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57-59
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Mosses on “nature friendly” banks of the North Sea canal (Spaarnwoude, the Netherlands). In 1997 the low dike along the North Sea canal near Spaarnwoude was cut to facilitate spontaneous vegetation development in a brackish environment. The shore of the resulting lake was examined for mosses in 1998 and 1999 and yielded 36 species including the more interesting Bryum imbricatum, B. intermedium, B. warneum, Dicranella varia, Didymodon tophaceus and Pohlia melanodon.
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