ALBERT

Description: The Scrophulariaceae, though chiefly a family of herbaceous plants, contain also a number of genera with trees ( Paulownia and Wightia) and genera with species of suffruticose and fruticose habit.\nMy colleague Mr. A. M. Cleef, who is studying the vegetation of the high Andean parts of Colombia collected material of the small genus Aragoa, endemic in the paramos of the Colombian and Venezuelan Andes. Though this genus consists in the main of small broomlike shrubs, a new species, Aragoa perez-arbelaeziana Romero, discovered by him, is a small tree, of which the stem reaches a diameter of 8 cm. The wood of Aragoa of which the structure was so far unknown, proved to be noteworthy because of the complete absence of rays and parenchyma. There was no indication at all of growth rings, and the vessels can not be distinguished from the fibres as seen on a cross section, as both are of equal width. In longitudinal sections vessels become recognizable by their simple perforations, their spiral thickenings and the presence of a few simple pits; whereas the fibre tracheids lack the spiral thickenings, and possess numerous bordered pits on both the radial and tangential walls. The diameter of the vessels and fibres varies in the 5 species investigated by me between 16 and 24 \xce\xbcm; the length of the vessel members is on the average 260 (185-370) \xce\xbcm and that of the fibre tracheids 310 (220-450) \xce\xbcm. This unusual wood structure was found not only in the small stems with a diameter of 4-8 mm, but also in the stem of the only arboreous species.

Description: Anon., Lichenen-nummer, Buxbaumiella 16, 1984, 56 pag. Elf artikelen over recente veranderingen in de Nederlandse lichenenflora, waarvan onder andere het artikel over het herstel van de lichenenflora in westelijk Zuid-Holland landelijke belangstelling heeft getrokken.\nAnon. (H. Weijs red.), Wilde planten van Utrecht, Provincie Utrecht, KNNV en Vereniging tot Behoud van natuurmonumenten in Nederland, 1984, 175 pag. (Te bestellen bij de Vereniging tot Behoud van Natuurmonumenten en de Koninklijke Nederlandse Natuurhistorische Vereniging, door storting van \xc6\x92 19,50 voor leden of \xc6\x92 22,50 voor niet-leden op giro 9988 t.n.v. Natuurmonumenten, \xe2\x80\x99s-Graveland of giro 13028 t.n.v. Bureau KNNV, Hoogwoud). Een rijk ge\xc3\xafllustreerd rapport over de resultaten van de in 1974 gestarte provinciale milieu-inventarisatie, waarin 119 soorten apart worden behandeld met een provinciaal verspreidingskaartje van elk op basis van kilometerhokken.

Description: Leptochloa fascicularis (Lamk.) A. Gray [Diplachne fascicularis (Lamk.) P.B.] has been found as an alien in the Netherlands. The author gives a key to the species of the genus in addition to that in Flora Neerlandica.

Description: A. J. QUEN\xc3\x89-BOTERENBROOD & J. MENNEMA, Zeldzame Nederlandse plantesoorten in Zuid-Holland. Provinciale Waterstaat Zuid-Holland, \xe2\x80\x99s-Gravenhage, 1973, 110 pag., 31 verspreidingskaarten en 4 figuren, fl. 5,\xe2\x80\x94.\nGemeentelijke, provinciale en landelijke overheid tonen zich de laatste jaren in toenemende mate belangstellend voor nauwkeurige gegevens over \xe2\x80\x9ehet milieu\xe2\x80\x9d. Het is uitermate verheugend dat de Provinciale Waterstaat van Zuid-Holland voor een serieus wetenschappelijk onderzoek niet alleen belangstelling heeft, maar het ook in alle opzichten stimuleert. De resultaten van het onderzoek naar de verspreiding van zeldzame planten, met name in Zuid-Holland, zijn neergelegd in vijf bijlagen, waarvan de tweede de belangrijkste is. Deze bijlage omvat 31 verspreidingskaarten van Nederlandse plantesoorten en is hiermee te beschouwen als de voorloper van de nu spoedig te verwachten Atlas van de Nederlandse Flora. De verspreidingskaarten zijn samengesteld op grond van IVON-hoklijsten, herbariummateriaal en literatuuropgaven en gesplitst in gegevens die dateren van v\xc3\xb3\xc3\xb3r en van n\xc3\xa1 1950, zodat bovendien de achteruitgang resp. vooruitgang van de betreflende soort snel kan worden afgelezen. De begeleidende tekst van elke kaart geeft aan deze een extra dimensie, niet in de laatste plaats door de verantwoording en documentatie van de niet-opgenomen gegevens, die in bijna alle tot dusverre verschenen atlassen over de verspreiding van planten in Europa ontbreken. Ik geloof stellig dat deze wijze van presentatie zeer de voorkeur verdient en dat het bezwaar van de lange duur der voorbereiding van zulke kaarten hierdoor ruimschoots wordt goedgemaakt.

Description: In 1975 two specimens of O. crocata were found in the dunes of Voorne. Since then the number increased to c. 50. The species is described and compared to other umbelliferous species, as it is likely to be mistaken for Petroselinum crispum or Apium graveolens vegetatively. Different observations on the smell of the plant and the colour of its juice are mentioned. The plant is virulently poisonous, which is illustrated with some references from literature. Its Atlantic-Westmediterranean area (fig. 2) has been reconstructed from literature and herbarium collections; somewhat uncertain is a record from Morocco. From an old collection its presence along the Northwest-coast of Italy could be confirmed. The habitats in Voorne, Normandy and Jersey are described and compared, also with records from other localities. At the localities in the northern part of France and in Holland it grows in coastal habitats characterized by a considerable seepage of fresh water rather rich in carbonates.

Description: Herba aquatica glabra. Caules submersi, monopodialiter et sympodialiter ramosi, breves. Stipulae subulatae, parvae. Folia alterna, integra, ipso apice saturatius colorata. Inflorescencia distincte a parte vegetativa separata, axibus filiformibus, ramosis, internodiis elongatis, quoque ramo apice racemum densum bractearum floralium rosuliformium natantium gerente. Bractea et flos apice axium brevium instructus. Bracteae florales ellipticae, integrae, apice saturatius coloratae, petiolo longitudine variabili. Bracteolae 2, basi pedunculi brevissimi instructae. Flores bisexuales; sepala 4 minuta; petala 4 concava; stamina 4, filamentis filiformibus; ovarium interius 4-loculare, profunde 4-lobum, quoque loculo stigmate elongato subulato laevi praedito. Fructus in mericarpia 4 apice tantum connata dehiscens.\nTypus: Vinkia natans van der Meijden.

Description: Name: Eurya Thunb., Nova Genera Plantarum (1783) 68.\nFamily: Theaceae.

Description: A qualitative and quantitative study has been made of the Recent taxa assigned, or related, to Balanus amphitrite Darwin. All taxa of the complex have been redescribed and a key provided. Interspecific relationships have been evaluated statistically through the use of the generalized distance function and discriminant function analyses. Two well defined groups and three subgroups have been defined and a key proposed. The discriminant function has also been utilized as an aid in the identification of unknown specimens of a closely related pair of taxa.

Description: The tridentigera group is one of four groups within the genus Chremistica St\xc3\xa5l, 1870. Its monophyly is based upon genitalia characters. The group comprises 11 species, of which 4 are redescribed and 3 are described as new ( (C. minor, C. siamensis, C. biloba). The remaining 4 species are endemic to the Philippines and are not redescribed. A key to the males, distribution maps, a phylogenetic reconstruction and a historical biogeographic hypothesis are presented. The tridentigera group is distributed in Southern India, Sri Lanka, Thailand, Laos, Malaya, Sumatra, Kalimantan and the Philippines.

Description: Using the ability of selective uptake by the neurons of their own secreted amines, two 3H labeled neurotransmitters were used: 5-hydroxytryptamine (5 HT, serotonin) and noradrenaline (NA). Autoradiographic study was conducted on semithin and on ultrathin sections.\nIn the brain, 3H-5 HT labeling is observed in the frontal lobes of the protocerebrum (two pairs of neurons) and in the lateral areas of the deutocerebrum and tritocerebrum (three or four pairs of neurons). A pair of labeled neurons is also present in each ganglion of the posterior part of the ventral nerve cord.\nIn the protocerebrum, 3H-NA is taken up by a pair of neurons located in the frontal lobes; two pairs of noradrenergic neurons can be found in each ganglion of the nerve cord.\nLabeled axons (5-HT and NA) are present in the brain and in the neuropils of the abdominal ganglions. The pathway of some cerebral axons can be followed in the perioesophageal connectives and in the cerebral glands.\nThese results are in agreement with the effects of injected neurotransmitters on (1) the brain electrical activity and (2) the stimulated activity of some of the protocerebral neurons (ultrastructural study by Jamault-Navarro in preparation).