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| Registros recuperados: 11 | |
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| Mennema, J.; Segal, S.. |
| The genus Parietaria L. in the Netherlands, 1 & 2. A study of herbarium specimens and of living plants of both species of Parietaria occurring in the Netherlands permits the following conclusions: 1. Both species can not possibly be conspecific on account of the constant differences in the morphology of the inflorescence, in the chromosome number, and in their periodicity, ecology and distributional areas. 2. The binomial Parietaria judaica L. 1756 has priority over the name P. diffusa proposed by Mertens & Koch in 1823, and the illegitimate name P. ramiflora Moench 1794. 3. The two species can be distinguished as follows: P. officinalis L., Sp. Pl., 1753, p. 1052. Syn.: P. erecta Mert. & Koch 1823; P. officinalis L. var. erecta (Mert. &... |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/528092 |
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| Segal, S.; Groenhart, M.C.. |
| The Zuideindigerwiede is a lake in the north-western part of the province of Overijssel (The Netherlands). The eastern part shows a succession of nymphaeids and helophytes. This series is exposed to the prevailing winds. The western part shows a succession of stratiotids, hydrocharids and pleustophytes and of ‘sapropelophytes’. In both cases there is an increase in vegetational structure, especially in the number of growth forms. Secundarily, a zonation of Ceratophyllum demersum may establish itself before the Stratiotes-zonation and a zonation of Calla palustris develops as a fringe around the floating islands. When ‘isolation’ of small masses of water occurs, a vegetation rich in Utricularia vulgaris may develop in places where the water is shallow and... |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/527837 |
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| Segal, S.. |
| Hybrids of the Dryopteris spinulosa complex in the Netherlands Kuntze ex Druce (= D. carthusiana X D. cristata) and D. x deweveri Dryopteris x uliginosa (Joh. Jansen) J. & W. ( = D. carthusiana X D. dilatata) have been recorded from several places in the Netherlands. Fern hybrids, generally speaking, can be recognised by the absence of indurated annulus cells (magnifying glass) and by the presence of abortive spores. Often hybrids tend to show, apart from intermediate characters, monstruosities in leaf shape (especially bifurcations), irregular growth of the crown of leaves sprouting from the rhizome, and hybrid vigour. The diagnostic characters of the hybrids are enumerated. Main characters in D. x uliginosa are: the connection of the basal leaf... |
| Tipo: Article / Letter to the editor |
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| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/528044 |
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| Segal, S.. |
| The lichen Ramalina intermedia Del. apud Lamy was found near Apeldoorn on a decayed wall of an old castle in the possession of the Royal family. The wall, rising up from the castle moat, dates from the 16th century, but remained covered with soil for several centuries after the moat had been filled up with earth, only to be dug out again during restoration work in 1904. R. intermedia has not been previously recorded from the Netherlands. At the Apeldoorn site it occurs together with Gyroweisia tenuis, a moss of rare occurrence in this country. |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/527236 |
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| Berg, C.C.; Segal, S.. |
| Cardamine pratensis L. in the Netherlands 242 specimens of the Cardamine pratensis aggregate from 58 Dutch localities were morphologically and cytologically studied. Two forms could be distinguished, viz. a form with usually lower chromosome numbers (2n = 28—32, rarely up to 52), and another with higher chromosome numbers (2n = 56—84), which, judging by the criteria applied by LÖVKVIST (12), correspond with C. pratensis sensu stricto and C. palustris (Wimm. & Grab.) Peterm. respectively. The frequent occurrence of ‘transitional’ forms and of specimens which are difficult to place, in conjunction with a number of cytological, genetical, and geographical arguments, make the present authors feel that, chiefly for practical reasons, it is preferable to... |
| Tipo: Article / Letter to the editor |
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| Ano: 1966 |
URL: http://www.repository.naturalis.nl/record/528144 |
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| Meinders-Groeneveld, J.; Segal, S.. |
| Pteridological Notes, 3 The genus Polypodium in the Netherlands Both Polypodium vulgare L. (sensu stricto) and P. interjectum Shivas occur in the Netherlands. Most of the differential characters reported in the literature overlap one another rather broadly, so that it is often necessary to use a ’syndrome’ of characters for the naming of individual specimens. The results obtained by the present authors do not correspond with those of SHIVAS (22), ROTHMALER & SCHNEIDER (18), or LENSKI (11) in every respect. The two forms appear to differ in the following features: P. vulgare: Frond lanceolate in outline with the lower pairs of pinnae approximately of equal length along a considerable portion of the frond blade, and the apical part often gradually... |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/527273 |
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| Hartog, C. den; Segal, S.; Sipkes, C.; Kasteel, J. van. |
| Tetramyxa parasitica Goebel. Deze schimmel, welke gewoonlijk gallen op Ruppia veroorzaakt, werd op enkele plaatsen in Zeeland waargenomen (Gorteria 1, no. 12, 1963, p. 138—140) en bleek ook aanwezig te zijn in herbarium-materiaal, al in 1868 op Texel verzameld (Gorteria 1, no. 14, 1963, p. 164). In 1965 werden de gallen van Tetramyxa parasitica gevonden in het Balgzandkanaal bij Den Helder, op Ruppia maritima en op Zannichellia palustris, en in een brakwaterplas op de Boschplaat op Terschelling, op Ruppia spiralis. |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/526510 |
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| Muller, F.M.; Segal, S.. |
| The sterile hybrid of Carex diandra Schrank and C. paniculata L. was found in two localities in the north-western part of the province of Overijssel in disturbed peat bog vegetations. The literature referring to this hybrid is reviewed. The name Carex X beckmannii F. W. Schultz was published in 1887, and, if published with a description, has priority over the name C. X germanica Richter ex Aschrs. & Graebn., 1902. The habitats of the hybrid are compared with those of the typical forms of the parents, and of a densely tufted form of Carex diandra which is rather common in the above-mentioned region. |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/527695 |
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| Lange, L. de; Segal, S.. |
| Flat forms of Lemna gibba (fig. 1, a—c) occur rather commonly and differ in several characters from L. minor (fig. 1, d—e), e.g.: The largest diameter of the air cavities below the lower surface of the discs averages 0,19 mm in L. minor, 0,36 mm in flat growth forms of L. gibba and 0,47 mm in swollen growth forms of the latter. In L. gibba the walls of the cavities are thicker than in L. minor. L. minor is usually more convex above and the shape of the discs is more elongate than in L. gibba. L. minor is bright green, L. gibba more greyish green suffused with reddish purple. Pigmentation, if present, starts at the edges of the discs in L. minor and in the centre of the upperside in L. gibba. Discs of L. minor are often found in groups of 5 or more (up to... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/527218 |
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| Segal, S.. |
| De door Linnaeus (1753) beschreven Juncus bufonius L. is een soort die de gemoederen van vele botanici in opstand heeft gebracht. Het is gebleken, dat er een aantal verwante taxa zijn waarvan de systematische betekenis nooit geheel duidelijk is geworden. Vele botanici hebben zich dan ook beijverd nieuwe soorten te beschrijven, anderen durfden dit niet aan en beschreven de van de typische J. bufonius afwijkende planten als ondersoorten of variëteiten van J. bufonius. Tot deze afwijkende typen behoren J. foliosus Desf., J. sphaerocarpus Nees, J. sorrentinii Parlat. (een Sardico-Siciliaans endeem), J. mutabilis Savi, J. ranarius Song. & Perr. en J. ambiguus Guss., elk met een aantal synoniemen. J. foliosus (vlakke, tot 2 mm brede bladeren) en J.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1960 |
URL: http://www.repository.naturalis.nl/record/534131 |
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| Registros recuperados: 11 | |
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