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Kwelschoffelmos, Scapania paludicola, een nieuw bebladerd levermos voor Nederland
R. van der Knoop
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1-3
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Scapania paludicola, a new leafy liverwort for the
Netherlands
The species was found in a lowland transition mire. Its
ecology and prospects are described in brief.
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Een nieuwe tandpastakorst, Ochrolechia arborea, en andere bijzondere
bewoners op hardhout in de Biesbosch
A. van der Pluijm & L. Verboom
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4-11
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Ochrolechia arborea and other interesting finds on hardwood in the Biesbosch in the Netherlands
In November 2024 some 50 species of mostly lichens and some mosses were found on a hardwood bird watching tower in the National Park the Biesbosch. Ochrolechia arborea is reported for the first time from the Netherlands. The taxon had previously been found elsewhere by Maarten Brand, but his records were yet unpublished. It is likely that several older records of O. androgyna in our country also refer to O. arborea, as it has usually not been tested with UV light. The wooden structure yielded several other species that were new or rare for the area, e.g. Hypogymnia spp., Melanohalea elegantula, Pertusaria amara, Physcia dubia, P. stellaris and Xanthomendoza sp. The Biesbosch area has shown that, under high levels of nitrogen (NH3) pollution, hardwood structures can act as a refugium for some acidophytic and oligotrophic lichens and mosses.
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BLWG-zomerkamp Parque Natural de Urbasa-Andía (Navarra, Spanje) – epifyten op veteraanbomen
K. van Dort
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12-30
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Epiphytic lichen communities in the Parque Natural of
de Urbasa-Andía (Navarra, Spain), 2022
In the summer of 2022 the BLWG visited the Parque
Natural of de Urbasa-Andía (Navarra, Spain). The
cryptogamic flora of Urbasa-Andía shows distinct oceanic
affinities (the stormy Gulf of Biskay is about 100
km away as the crow flies). The woods proved to be
exceptionally rich in species. Well over 200 epiphytic
lichens were recorded by the six lichen interested
participants. They focused on the old beech-dominated
woodlands and the (semi)evergreen oakwoods. In
search of rare rain shadow specialists special attention
was paid to the pollarded beeches (‘trasmochos’) and
the veteran oak trees in the pasture woodlands (‘dehesas’),
an increasingly rare habitat throughout Europe.
Lobarion-species appear scattered throughout the
area, e.g. Dendriscocaulon umhausense, Fuscopannaria
ignobilis, F. olivacea, Leptogium saturninum, Lobarina
scrobiculata, Nephroma laevigatum, N. resupinatum
and Ricasolia amplissima. Species of conservation
concern recorded from the beech forests are Microcalicium
disseminatum and Sclerophora peronella. Veteran
oaks (Quercus pubescens) are rich in ‘rain shadow
specialists’ (Caliciaceae), among which nine members
of the genus Chaenotheca (including C. brachypoda,
chlorella, chrysocephala, hispidula and phaeocephala),
Calicium adspersum, C. glaucellum, C. salicinum and C.
quercinum, and Sclerophora pallida.
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Riccardia aequicellularis (Steph.) Hewson op de Veluwe: een nieuwe antipodale levermossoort voor Europa
H.N. Siebel & R.J. Bijlsma
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31-37
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Riccardia aequicellularis (Steph.) Hewson in the
Veluwe area (Central Netherlands): a new antipodal
liverwort species to Europe
A puzzling Riccardia taxon with narrow thallus from
the northern part of the Veluwe area in the Netherlands
was compared to Riccardia species described
worldwide from regions with comparable climate. It
turned out to match only and perfectly with descriptions
of Riccardia aequicellularis (Steph.) Hewson
from New Zealand and Australia. It is another newly
introduced species in Europe from that region. How it
arrived in the Netherlands is unknown. The most important
differences with European Riccardia chamedryfolia
and R. incurvata are the narrow biconvex thallus,
the oilbodies only present in part of the epidermal
cells. The epidermal cells are as large or larger than
the internal cells in transverse section. It occurs in wet,
acidic heathland.
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Gymnostomum viridulum (stomp kalkmos) nieuw voor Nederland, en andere bijzondere mossen en lichenen op de Bemelerberg
L. Verboom
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38-43
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Gymnostomum viridulum new to the
Netherlands, and other finds of rare
mosses and lichens on Bemelerberg,
Province of Limburg
A survey of the Bemelerberg (Province
of Limburg, the Netherlands) was
carried out, where both lichens and
bryophytes were identified. It yielded
a few rare species. The moss Gymnostomum
viridulum was recorded for
the first time in the Netherlands. It
was growing on thin calcareous soil
on top of a cliff.
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Verenigingsnieuws
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44-45
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Twee opmerkelijke korstmossenboeken...
L.B. Sparrius
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45-46
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Boekbespreking: Lichens of Ireland and Great Britain. A visual guide to their identification
L. Verboom
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46-47
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BLWG Lezingendag 2025
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48-48
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Algemene Ledenvergadering van de BLWG
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49-49
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BLWG Jaarverslag 2024
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50-52
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Huub van Melick benoemd tot Ridder in de Orde van Oranje Nassau
M. Smulders
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53-56
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Adrie Gladdines in memoriam
P. van der Wiel & F. Franken
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56-57
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Activiteitenoverzicht
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58-59
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Vragen aan... Dirk De Beer
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59-60
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