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Schistostega pennata (Hedw.) Web. & Mohr. (Lichtmos) nieuw voor Nederland
A.C. Rozemeijer
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1-4
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Schistostega pennata (Hedw.) Web. & Mohr new to the Netherlands. In Januari 2005 Schistostega pennata was found in the municipality of Rheden (province of Gelderland). It grows in small quantity in a cavity of a loamy, west-facing slope, situated below a mixed forest.
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Mossen op de Bentelerheide (Twente, Overijssel)
H.R. Zielman
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5-9
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Mosses of the Bentelerheide (Twente, Prov. of Overijssel)
Triggered by the discovery of Hypnum imponens an excursion was arranged to support inventory work at the Bentelerheide, near Hengelo (Netherlands) by a local nature conservancy group. This group has extended its work from cleaning at a nearby Cirsio dissecti-Molinetum vegetation to cutting sods and tree felling at a terrain covered by heather vegetation and willow shrubs. The moss flora mainly consists of regular species of the common Dutch pleistocene landscapes: various Dicranaceae and Brachytheciaceae. However, also a number of Sphagnum species, including S. magellanicum were discovered. Most exciting was the discovery of Thuidium delicatulum, a species very rarely found in the past century.
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Bazzania trilobata (L.) S.F. Gray nieuw voor Fryslân
J. Koopman & H. Waltje
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10-18
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Bazzania trilobata (L.) S.F. Gray new to the province of Friesland. Bazzania trilobata is a very rare liverwort in the Netherlands. Only 15 records are known since 1800 including 6 discovered since 1997. Almost all locations are situated in the central part of the country, but in 2001 the species was found in the province of Friesland. This is the northernmost site in the Netherlands so far. A chronological overview of all finds in the country is presented.
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Een lichenologische excursie naar Lille en omgeving (België, provincie Antwerpen)
D. Van den Broeck, A. Aptroot, D. Jordaens, L.B. Sparrius & J. Poeck
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19-22
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A lichenological excursion to Lille and surroundings (Belgium, Prov. Antwerpen). Report of a field trip in 2004 to several churches, e.g. with Lecanora pannonica, and some roadside trees, e.g. with the usually saxicolous Scoliciosporum umbrinum, and to a forest. This forest yielded several indicators of ancient woodland, e.g. Lecanactis abietina, Lepraria umbricola and Cladonia incrassata. Even a foliicolous lichen was found on leaves of Ilex: Fellhaneropsis myrtillicola.
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Philonotis hastata (Duby) Wijk & Marg., een tropisch mos gevonden in een onverwarmde kas te Eelde (Drenthe)
B.O. van Zanten
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23-27
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Philonotis hastata (Duby) Wijk & Marg., a tropical moss found in an unheated greenhouse in Eelde (Province of Drenthe, Netherlands)
The pantropical moss Philonotis hastata (Duby) Wijk & Marg. has been found in an unheated greenhouse of a nursery in the village of Eelde south of the city of Groningen. The species is similar to the European Ph. capillaris but differs mainly by its larger lamina cells (ca. 20-40 µm long and 10-15 µm wide against ca. 14-29 and 7-10 µm in Ph. capillaris) and the different axillary gemmae. These are very small (0.7-0.8 mm), caduceus and therefore found usually only in the tomentum and attached soil. They consist of a leafless stem with only a tuft of small leaves in the upper half. In Ph. capillaris the stems of the gemmae are up to ca. 2 mm long with small leaves evenly arranged along the stems. The specimen is intermediate between Ph. hastata and Ph. evaninervis, also a tropical species. It has the acute leaf apex and the in the apex vanishing nerve of Ph. hastata but the single teeth and almost smooth, lax areolation of Ph. evaninervis. This reinforces Eddy’s view (1996) that Ph. hastata and Ph. evaninervis are conspecific, the latter being an aquatic modification of the former. Also Koponen & Norris (1996) consider the two species being conspecific. It is most likely that the species is introduced with plants or soil. Frahm (1976, 1995) and Casas Sicart (1981) mention the species also from southern Spain (Sierra Nevada) but this record is most likely based on a misidentification. The specimen on which the record is based is probably lost so that re-identification is not possible (J.-P. Frahm, personal communication).
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Correlatie tussen chemie en morfologie in Nederlandse Peltigera didactyla
J.L. Spier & A. Aptroot
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28-30
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Correlation between chemistry and morphology in Dutch Peltigera didactyla. Chemical examination of 69 specimens of Peltigera didactyla from the Netherlands revealed that 31,6% contained methyl gyrophorate. Gyrophoric acid was found in 13 % of the specimens. However, no specimens morphologically belonging to Peltigera extenuata were found. It is therefore concluded that Peltigera didactyla s. str. in the Netherlands contains two chemotypes, one of which is usually thought to occur only in P. extenuata.
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Een bryologische excursie naar de Dintelse Gorzen (prov. Noord-Brabant) op 27 maart 2004
A.P. Gladdines
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31-33
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A bryological excursion to the Dintelse Gorzen in 2004 (Prov. of Noord-Brabant). Nature reserve Dintelse Gorzen is a former salt-marsh outside the dikes of the Volkerak, part of the estuarine formations in the southwestern part of the Netherlands. Despite the embankments in the seventies the area is still brackish with vascular plants such as Salicornia and Suaeda as well as thousands of orchids, Parnassia and the rare Cotula coronopifolia. The shore area with calcareous sands is flooded every winter and harbours a rich bryophyte flora, including Brachythecium mildeanum, Campylium stellatum, Hennediella heimii, Preissia quadrata and Leiocolea badensis. Orthotrichum patens was found on a willow together with other increasing epiphytes such as Cryphaea, Radula and Ulota phyllantha.
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Over het voorkomen van kapsels bij zelden fructificerende mossen in Groningen en Drenthe
B.O. van Zanten
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34-46
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On the occurrence of sporophytes of rarely fruiting bryophytes in the provinces of Groningen and Drenthe, the Netherlands. A list of 33 rarely fruiting bryophyte species of which we found sporophytes is given. Some of the listed species were more often fruiting in the past. The decline of sporophyte production may be caused by air-pollution. Examples are: Dicranum scoparium, Isothecium myosuroides, Plagiomnium undulatum, Plagiothecium undulatum and Thuidium tamariscinum. Because of the better air quality in recent decades (especially SO2 reduction) it can be expected that spore production in this group of species will increase. For Dicranum scoparium, Isothecium myosuroides, Plagiothecium undulatum and Thuidium tamariscinum this seems to be the case as a number of fruiting populations of these species were found recently. Also the wet and mild winters of the last decade may stimulate sporophyte production. Of Pohlia annotina nine fruiting collections were made before 1906 and none afterwards, until recently Buter (2004) found two fruiting populations. We found Pohlia annotina richly fruiting (in April 2002) on loam of a demineralised arable field. In November of the same year at exact the same locality there were only few plants of Pohlia annotina left, but there was much (sterile) Pohlia camptotrachela present. In some species (Bryum pseudotriquetrum, Eurhynchium praelongum) the sporophyte production is more frequent in coastal areas than further inland. Of Hedwigia stellata and Racomitrium heterostichum, two very rare species on granite boulders of prehistoric graves, we found a few sporophytes which were not found since 1947, respectively 1967. The young sporophytes of Drepanocladus aduncus broke off very easily from the stems, the perichaetia remaining at the base of the setae. We found fruiting plants of Blasia pusilla, which were found only three times before. Sporophytes of this species mature normally in spring, but we found ripe capsules in November. It is argued that the recent increase of fruiting collections in some cases may be due to a higher search-intensity. The production of gemmae (including tubers) in Blasia pusilla, Bryum gemmiferum, B. rubens, Calypogeia fissa, C. muelleriana, Plagiothecium nemorale and Zygodon conoideus was not hampered by sporophyte production. Some of the fruiting plants of Didymodon rigidulus produced also abundantly gemmae. Gemmae bearing shoots of fruiting Pohlia annotina were usually shorter than shoots of non-fruiting plants.
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Weissia rostellata (Brid.) Lindb. (Dwergparelmos) is minder zeldzaam dan gedacht
Th.B.M. Kerkhof
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47-58
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Weissia rostellata (Brid.) Lindb. is less rare than supposed
Shortly after the rediscovery of Weissia rostellata in the Netherlands (Buter 1999), this rare species was found again in no less than 11 km-squares in the region Alblasserwaard-Vijfheerenlanden, a clayey to peaty area bordering on the rivers Lek and Merwede (branches of the Rhine). Firstly, great numbers of it were discovered in a former orchard, 3 dm of the top soil of which had been removed the year before to create a wet habitat for amphibians. Investigation of a number of former pastures in the surroundings, which had received a similar treatment to create wet, nutrient-poor grasslands, led to the astonishing conclusion that Weissia rostellata was present at all of the localities. In all cases the remaining soil consists of non-calcareous, baserich, heavy clay or clay-on-peat. Furthermore, small quantities of Weissia were discovered in two shallow channels, also on non-calcareous clay, in pastures that had not been dug off. As Weissia rostellata is absent in more than 1000 relevés made in these polders in the period 1976–2001, whereas other small mosses like Pseudephemerum nitidum and Leptobryum pyriforme have been recorded a great many times, it is concluded that it probably has emerged from the spore bank. All localities are situated in low lying polders, which before 1950 were frequently inundated, especially during winter, when the (wind) mills could not perform a perfect drainage of the land. It seems quite probable that Weissia rostellata was a rather common pioneer species in the nutrient-poor, often very wet meadowland of those days. It is telling that in the recently dug off localities Weissia rostellata is accompanied by some vascular plants that are characteristic of the former nutrient poor fen meadows, such as Viola persicifolia, Carex oederi, C. panicea, Potentilla anglica and Agrostis canina. The recent distribution (1999–2004) of the species in the Netherlands is shown in Fig. 1. Fourteen relevés, stemming from eight permanent plots in which Weissia rostellata has shown up, have been summarized in the synoptic Table 2. The leftmost column shows the mosses that appeared 1–2 years after the digging; the column next to it contains the data collected 3–5 years after the digging. The mosses that accompanied Weissia rostellata in a rather dry, shallow gully are in column G.
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Jaarverslag BLWG 2003
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59-60
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Jaarverslag BLWG 2004
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61-63
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Wijzigingen ledenlijst BLWG t/m 21 maart 2005
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63-64
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