ALBERT

Description: A second list of species found near Hellevoetsluis, prov. S. Holland, on heaps of stones used for the Delta-works. See also Gorteria 3 (4), 1966, p. 49\xe2\x80\x9451.

Description: Two adventitious species of the genus Beckmannia Host have been found in the Netherlands. They can be distinguished as follows: 1. Stems mostly tuberously thickened at the base. Spikelets always 2-flowered (fig. 1, a). Glumes always more or less irregularly dentate at the mostly rounded and mostly very shortly acuminate apex, and with often very shortly ciliate margins, hardly swollen when ripe. Ripe stamens mostly distinctly exserted; anthers 1,6\xe2\x80\x942,1 mm long (fig. 1, b) B. eruciformis (L.) Host 1\xe2\x80\x99. Stems not thickened at the base. Spikelets 1-flowered (fig. 1, c); sometimes a few 2-flowered spikelets are present in the spike. Glumes entire at the acute and distinctly acuminate apex, and with glabrous margins, mostly rather strongly swollen when ripe. Ripe stamens mostly but slightly exserted; anthers 0,7\xe2\x80\x941,1 mm long (fig. 1, d) ... B. syzigachne (Steud.) Fern.

Description: The water-strider Gerris najas is found on running waters and lakeshores. In the Netherlands it occurs mainly in brooks. It preys upon insects fallen on the water-surface.\nIn order to ascertain the recent distribution in the Netherlands, the author visited most of the running waters and lakes in this country in the years 1962 to 1966 inclusive.

Description: A re-examination of the types of Lithobius occultus Silvestri, 1894, and Lithobius excellens Silvestri, 1894, from Italy, has shown that the two are based on specimens of the same species which takes the name of Eupolybothrus (Schizopolybothrus) excellens (Silvestri, 1894), and is probably most closely related to E. tabularum (Verhoeff, 1937). A tentative survey of the subgenera of the genus Eupolybothrus Verhoeff, 1907, is given, and a new subgenus, Leptopolybothrus nov. subgen., type-species Lithobius leptopus Latzel, 1880, is erected.

Description: Het enorm grote aantal postzegels dat tegenwoordig over de gehele wereld wordt uitgegeven is er de hoofdoorzaak van dat vele Philatelisten zich zijn gaan specialiseren door \xc3\xb3fwel slechts zegels van bepaalde landen te verzamelen \xc3\xb3f door een z.g. beeldverzameling op te bouwen. De duidelijke tendens die bij de posterijen van vele landen bestaat om hun zegels voor \xe2\x80\x9ebeeld" Philatelisten aantrekkelijk te maken, draagt er toe bij dat zelfs het bijeenbrengen van een zeer gespecialiseerde beeldverzameling een fascinerende bezigheid is. Het is tegenwoordig reeds vrijwel onmogelijk om zonder grote kosten een representatieve verzameling postzegels met dierenafbeeldingen op te bouwen. Maar een dergelijke collectie tot een kleine diergroep te beperken, en deze dan ook zeer grondig te verzamelen, is zowel financieel mogelijk als zeer interessant en boeiend. Een dergelijke beperkte diergroep die relatief weinig op postzegels afgebeeld wordt is die der schaaldieren of kreeftachtigen (Crustacea). Deze dieren zijn zeer decoratief en lenen zich uitstekend om als motief op postzegels gebruikt te worden, zoals duidelijk uit de hier gegeven afbeeldingen blijkt.\nHet aantal mij bekende postzegels dat afbeeldingen van Crustacea draagt is kleiner dan 100. Zij vari\xc3\xabren van zeer fraai uitgevoerde, zowel wetenschappelijk als artistiek volkomen verantwoorde afbeeldingen, waaruit de identiteit van de soort nauwkeurig bepaald kan worden, tot zeer schematische of gestyleerde figuren, waaraan men nauwelijks kan zien dat zij een schaaldier voorstellen.\nIn deze bijdrage wordt getracht een zo volledig mogelijk overzicht te geven van alle postzegels die de afbeelding van een of meer schaaldieren dragen. De oudste mij bekende zegels met een dergelijk onderwerp zijn

Description: One of the major scientific efforts of the decade has been the International Indian Ocean Expedition of 1960\xe2\x80\x9464, involving several institutions and ships and numerous scientists. With an oceanographic focus, not only physical and biological open sea oceanographic studies were carried on, but littoral and sublittoral work as well, on shores and reefs. Geographically, too, the range was wide, and respecting algae particularly so, though predominately western.\nThe chief algal collectors were Professors G. F. Papenfuss (University of California, Berkeley) and R. F. Scagel (University of British Columbia). Papenfuss joined the Israel South Red Sea Expedition prior to sharing in the Indian Ocean Expedition, and Scagel joined him to work on the African east coast and off-lying islands, continuing south to Cape Town. The Red Sea Caulerpas will be reported elsewhere by myself, and those from South Africa by Papenfuss. To a few Australian collections from Scagel are added a few more from Singapore and elsewhere by Dr. L. H. Colinvaux (Ohio State University) and Professor R. E. Norris (University of Washington). Materials from Papenfuss and Scagel reached me in generous measure directly from the collectors; material from the others came by courtesy of the Smithsonian Oceanographic Sorting Center, and to all these sources I am much indebted for the materials and for information of various kinds.

Description: The present paper is the first of a series of regional revisions of the Old World Lindsaeoid ferns centering around a revision of the group in the Flora Malesiana area where the largest number of species occurs. In the few cases where modern revisions are already available the present author\xe2\x80\x99s contribution will be limited to critical and additional notes; otherwise they will be in the nature of monographic treatments, although widespread species will, of course, as a rule not be described more than once.\nThe botanically isolated position of New Caledonia is well-known, and most floristic phytogeographers agree in regarding it as a separate floristic region (e.g. Good, 1947; Van Balgooy, 1960). Endemism is high in the ferns as well as in the flowering plants, although the number of endemic fern genera is very small (Brownlie, 1965). In the absence of a comprehensive modern fern flora I am unable to quote any reliable figures. The last paper dealing with the New Caledonian fern flora as a whole by Fournier (1873) is nearly 100 years old. Later contributions were made notably by Copeland (1929b), Christensen (in: D\xc3\xa4niker, 1932), and Guillaumin (1962- 1964). Christ (1910), on the basis of Fournier\xe2\x80\x99s (1873) data, reported 259 species, 86 endemic, but stated that Fournier\xe2\x80\x99s species concept was apparently too narrow (p. 234), which I can confirm for the Lindsaea group, as shown by the synonymy in the present paper. On the other hand, additional species have been found or distinguished since. A more important factor limiting our knowledge of endemism in the New Caledonian ferns (and other plants) is, I think, the poor state of knowledge of the Melanesian flora, particularly of the Solomon Islands. The exploration that is now in progress in this archipelago may be expected to furnish important additional data.

Description: A survey is given of the types of the sclereids and the sclereid patterns occurring in the leaves of the Marcgraviaceae. Eight main categories of sclereids are distinguished on the base of the morphology of the sclereids. A comparison is made with the foliar sclereids found in some other families. The systematic value and the function of the sclereids are briefly discussed. Some new combinations of names are published.

Description: The genus Caltha comprises approximately 12-16 species growing in wet, marshy places in arctic and North and South temperate regions. The genus in classed in the tribe Helleboreae of the Ranunculaceae. A. de Candolle (1818) subdivided the genus into two sections: Psychrophila and Populago, the distinguishing features being that in the former the calyx is persistent, the auricles of the leaf laminae having upturned to erect appendages, whereas in the latter the calyx is deciduous and the leaves are cordate to reniform. In the section Psychrophila he placed two species of the Southern Hemisphere, the other section including all the species of the Northern Hemisphere. The peculiar leaf characters of the species of the Southern Hemisphere (5-8) are highly distinctive.\nNot only the morphological characters of some species of the genus vary considerably, but also in terms of cytology differentiation within the genus and even within species occurs. Therefore, various authors differ in that opinion with regard to the taxonomic treatment of the many forms.

Description: This study was undertaken in 1963 at the suggestion of Prof. Dr. J. Lanjouw. As the genus Convolvulus is so large that a revision of all its species would have taken too much time, and as a revision of the African ones alone would not have been interesting because these species do not form a natural group, it was decided to choose a middle way, and to take into consideration also the species occurring in the adjoining countries. This was all the more Indicated as the Convolvulus species of the area which includes besides the Mediterranean region also the area extending eastwards of the latter to the western border of Afghanistan, i. e. such countries as Iraq and Iran, show many signs of affinity. During our study of the species occurring in these parts, it was realized that it would be desirable to consider also those occurring in Afghanistan and Turkmeniskaya and further to the west in the Caucasus, Armenia and a part of the area surrounding the Black Sea. The Canary and Madeira Isles were also included, as they are close to the North African part of this region and as these islands moreover are interesting because they show a high degree of endemism and because some of the Convolvulus species occurring here were regarded by some authors as sufficiently distinct from those found elsewhere to be referred to a genus of their own, a genus for which the name Rhodorrhiza was proposed.\nThe genus Convolvulus was introduced by Linnaeus (1753). In 1789 it was revised by Desrousseaux, who described 107 species under the heading \xe2\x80\x9cLiseron\xe2\x80\x9d; he divided the genus into two subdivisions, viz. 1\xc2\xb0 \xe2\x80\x9cpeduncles with solitary flowers\xe2\x80\x9d and 2\xc2\xb0 \xe2\x80\x9cpeduncles with numerous flowers\xe2\x80\x9d; in the delimitation of the genus he followed Linnaeus.