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Het geslacht Fellhanera in Nederland
J.L. Spier, A. Aptroot, C.M. van Herk & L.B. Sparrius
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2-6
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Fellhanera in the Netherlands
Fellhanera is a predominantly tropical genus of crustose lichens. In the last decade two species, F. ochracea and F. viridisorediata, have been described as new to science on the basis of material from the Netherlands and surrounding countries, after being known for decades as sterile crusts. The two remaining Dutch species, F. bouteillei and F. subtilis, show a conspicuous increase from absent or extinct 25 years ago to rather common in the nineties. All species show a preference for sheltered sites, but occur on a variety of substrata including rock, tree bases, Vaccinium and other twigs. The presence of asemone in addition to usnic acid and zeorin (and an additional terpenoid) is reported from Fellhanera bouteillei for the first time.
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Mossen bij Lochem, met name op landgoed Aspen
H.R. Zielman
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7-10
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Bryophytes near Lochem, in particular the estate of Ampsen (province of Gelderland)
A report of two field trips to the estate of Ampsen near Lochem in 1999 and 2000. Remarkable findings are Dicranum majus, D. fuscescens and several hepatics from loamy soils such as Diplophyllum albicans and Calypogeia species.
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De bryologische excursie naar Gran Canaria in 1996
K.W. van Dort & J.A.W. Nieuwkoop
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11-27
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The bryological field trip to Gran Canaria in 1996
In February 1996 a group of Dutch bryologists visited Gran Canaria to reach a better understanding of the bryoflora of the Canary Islands. Special attention was paid to the so far infrequently investigated coastal zones. Great effort was made to discover any new sites of Riella species. Due to the wet winter seasonal communities were well developed. Riccia-species and other thallose liverworts were especially common. Interesting finds are Riccia ciliifera, R. macrocarpa, Riella cossoniana, R. notarisii, Sphaerocarpos michelii, S. texanus, Andreaea heinemannii, Cheilothela chloropus, Gigaspermum mouretii, Homalia lusitanica, H. webbiana, Oedipodiella australis and Tortula israelis. A brief botanical comment of the sites visited and a preliminary species list comprising 194 species (including 55 liverworts) is given.
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Spits dubbeltandmos (Dydimodon acutus (Brid.) K. Saito) nog steeds in Nederland
P.B.T.H. Spreuwenberg & W. Simons
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28-29
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Didymodon acutus still occurs in the Netherlands
Didymodon acutus was discovered on a shaded limestone boulder (Maastricht formation) in the Welterveld chalk grassland area (Voerendaal municipality, province of Limburg). The two earlier records of this species in the Netherlands date from 1931 and 1949.
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De mossenexcursie naar de Nieuwe Zuider Lingedijk in 2000
Th.B.M. Kerkhof
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30-35
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Mosses of the Nieuwe Zuider Lingedijk near Leerdam
The reserve Nieuwe Zuider Lingedijk, about three kilometers south of Leerdam, consists of reed-lands, woods (mainly alder and willow, with scattered oak, ash and elder near the fringes), osier-beds and a few floating fens. These marshy sites with peaty soils are situated along both sides of a heavy clay dike. A couple of concrete pill-boxes at the fringe of the woods and swamps testify to the former military function of the dike. In 2000 two square kilometers, containing a substantial part of the reserve and the dike, were investigated bryologically in behalf of the monitoring project of the Dutch Bryologicol and Lichenological Society. A small part of a third square kilometer was also investigated. A total of 107 mosses and 8 liverworts were found. Orthotrichum acuminatum was found for the second time in the Netherlands (Van der Pluijm 2001). Some other interesting finds are Tortella tortuosa and Pylaisia polyantha (on pill-boxes), Sphagnum flexuosum (in floating fens) and Fissidens adianthoides (in alder-wood). Again it appeared that epifytic mosses (such as Orthotrichum and Ulota spec.) are performing much better than a decade ago, probably due to a reduction of air-pollution.
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Mossenexcursie naar het Labbegat 2 bij Sprang-Capelle
C.G. Buter
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36-39
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A bryological excursion to nature reserve Labbegat 2 near Sprang-Capelle (province of North-Brabant)
Labbegat 2, part of a typical Dutch rural landscape shaped in the past by (cattle) farmers, consists of narrow and long sections of grasslands, bounded by straight ditches. The terrain is at or just below sealevel and is periodically inundated. During the early nineties Labbegat 2 became a nature reserve. Between 1995 and 1997 the top layer of the soil was removed, resulting in bare ground (sand, peat and clay), expecting (hoping for) the re-establishment of the former rich flora (from before 1950). Compared to the list of mosses found in 1997/98, several interesting species were refound in 2002 (e.g. Warnstorfia exannulata, Lophozia capitata, Riccardia incurvata) and some new species could be added (e.g. Dicranum spurium, Sphagnum capillifolium, S. teres).
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Peltigera polydactylon komt niet voor in Nederland
J.L. Spier
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40-41
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Peltigera polydactylon (Peltigera polydactyla) does not occur in the Netherlands
There is no evidence that Peltigera polydactylon (P. polydactyla) ever occurred in the Netherlands. Three from the four collections Peltigera polydactylon (P. polydactyla) which Vitikainen (1994) mentions from the Netherlands appear to be P. neckeri, the fourth one being P. hymenina. Eleven collections -once identified as P. polydactyla were revised by Vitikainen and appeared to be P. hymenina. Additional study of 76 other collections did not reveal any P. polydactylon.
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Ontwikkelingen in de terrestrische korstmosvegetaties van de Loonse en Drunense Duinen (N. Br.) in de periode 1994-2001
R. Ketner-Oostra & H. van der Loo
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42-57
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Developments in the terrestrial lichen vegetation of the Loonse & Drunense Duinen (province of Noord Brabant, NL) in the 1990s
In the 1994-1996 period an investigation of the terrestrial lichen vegetation took place in an inland sand dune area of pleistocene origin, both with sand dune landscape, heathland and former coppice oak wood. The demolition of the sand dunes by military practice until the 1990s, was followed by intense recreation, including horse riding. This resulted in a very large area of bare sand with no undergrowth in the surrounding edges of the Pinus sylvestris wood. Only in the centrally located remnants of the coppice wood, were there found significant diversity and quantity of lichens. Probably connected with a fire prior to the 1980’s, lichens thrived in a wood reserve in the western part of this National Park. In 2001 these observations were confirmed. In addition, recent management practices in the western heathlands, such as, temporary grazing by sheep, sod cutting and removing self-sown trees, proved to be very successful for lichen establishment. In the young Calluna vulgaris-vegetation the reindeer lichen Cladina portentosa increased considerably, together with several Cladonia-species. This might indicate a reduced effect of N-deposition in this western location, where ammonium production is somewhat lower in comparison to that in the eastern part of this province.
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Recente waarnemingen van Atrichum angustatum (Rood rimpelmos)
H.A.M. Smulders
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58-60
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Recent records of Atrichum angustatum in the Netherlands
In 2002 and 2003 Atrichum angustatum was found at three localities, two times in the south of the Netherlands (Zuid-Limburg, province of Limburg) and once in the centre (Veluwe area, province of Gelderland). Formerly it was found near Zeddam in 1856 and in Oost-Flevoland in 1984. Two of the recent records concern more or less shaded, loamy uprootings of trees, the third refers to several small populations in a south facing chalk grassland with ant hills.
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Licheenzuren in Cladonia floerkeana (Fr.) Floerke in Nederland
J.L. Spier & A. Aptroot
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61-62
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Secondary substances in Cladonia floerkeana in the Netherlands
Eighty-nine specimens of Cladonia floerkeana were analyzed by TLC. Four chemical strains were found: Barbatic acid (12,4%), barbatic acid with 4-0-demethylbarbatic (83,1%), barbatic with squamatic acid (3,4%) and barbatic with thamnolic acid (1,1%). The squamatic strain has been previously recognized at species level as C. berghsonii. However, as no correlation with morphology, distribution or ecology was observed, it is not accepted as a species.
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Wijzigingen ledenlijst BLWG t/m 3 juni 2003
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63-64
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