|
|
|
| Registros recuperados: 23 | |
|
|
| Roos, M.C.. |
| This is the second book by this author dealing with the Pinaceae. In 1984 he treated the genus Pinus, now he treats the remaining genera of the family. An overview of the genera and their species is given, as well as keys to the subfamilies and genera, and to the species. Various aspects of the taxa are described, including nomenclature, infraspecific delimitation, vegetative and generative morphology, ecology, and distribution pattern. The book is well illustrated with black-and-white drawings of each species, showing their habitus and a number of morphological details. The distributions are indicated on very small-sized world maps; in case of restricted distributions usually, but unfortunately not always, accompanied by a more detailed map. A separate... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/525953 |
| |
|
|
| Roos, M.C.. |
| The last two years I have made an inventory of the Flora Malesiana network and the revision work remaining. In total the network comprises c. 130 contributors working on 90 of the remaining 135 families (see Appendix). From an estimate by specialists on species numbers of vascular plants in Malesia it appears that the Malesian flora is far richer than traditionally assumed, amounting to some 42000. This means that the flora comprises c. 13% of the world flora of vascular plants on c. 2% of the land surface. For the ferns the figure is probably up to 30% of the total number of species. Subsequently, all specialists revising taxa for Flora Malesiana were sent a questionnaire asking information on progress, possible bottlenecks, and the expected date of... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/532957 |
| |
|
| |
|
|
| Zhu, H.; Roos, M.C.; Ridsdale, C.E.. |
| Based on herbarium collections, the Malesian species of the genus Lasianthus are revised. A total of 131 species including 5 subspecies and 6 varieties are recognized from the Malesian region, of which 41 species, 3 subspecies and 3 varieties are described as new, and 3 new combinations are made for varieties. 22 species names and 15 variety names are reduced to synonyms. Ten species names and 2 varieties are treated as dubious mainly because their types cannot be traced. Additionally, 11 species are further excluded from Lasianthus. All species are described and a key to Malesian Lasianthus is given. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Lasiantheae; Lasianthus; Malesia; Revision; Rubiaceae. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/526201 |
| |
|
| |
|
|
| Roos, M.C.. |
| This book summarizes in a rather popular way scattered information on the problem of conservation of plant diversity. Ordered to the eight major regions of the world, a rather arbitrary selection of about 2000 rare and endangered species are described, some 250 also illustrated, partly in colour. The commission on endangered plant species under the IUCN has estimated that c. 20,000 species of higher plants need protection, whereas they include only 250 species in the Red data book of plants. This illustrates the very much incomplete knowledge of the current conservation status of plant species. Therefore, any attempt to summarize the present state of knowledge is unavoidably rather erratic. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1994 |
URL: http://www.repository.naturalis.nl/record/524950 |
| |
|
| |
|
|
| Avé, W.; Balgooy, M.M.J. van; Franken, N.A.P.; Roos, M.C.; Hoogland, R.D.; Veldkamp, J.F.; Laubenfels, D.J. de; Jansen, M.E.; Vink, W.; Kessler, J.J.; Haegi, L.; Symon, D.E.. |
| Name: Campynema Labill, Nov. Holl. Pl. Sp. 1 (1805) 93, t. 121. Family: Amaryllidaceae. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1984 |
URL: http://www.repository.naturalis.nl/record/509482 |
| |
|
| |
|
| |
|
| |
|
|
| Roos, M.C.. |
| Anticipating a forthcoming monograph of the subfamily Drynarioideae (Polypodiaceae), six new combinations in Aglaomorpha are made. Apart from full synonymy and descriptions, this monograph will include the phylogenetic systematics of this group. The phylogenetic relationships established lead to the recognition of the holophyletic genera Aglaomorpha and Drynaria only. The generic delimitation of Drynaria is not affected, but Aglaomorpha needs to be emended including all other (mostly monotypic) drynarioid genera. As a consequence, the following nomenclatural changes are necessary. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/535265 |
| |
|
|
| Roos, M.C.. |
| The drynarioid Polypodiaceae consist of about 30 usually epiphytic species confined to the Palaeotropics. They belong to Drynaria (c. 16 spp.) and a number of smaller genera, e.g. Aglaomorpha, Merinthosorus, or monotypic ones, e.g. Drynariopsis, Holostachyum. The generic delimitations as well as the phylogenetic relationships of the taxa are part of a project on the Systematics of the Polypodiaceae carried out in Utrecht. New Guinea is of special interest for the drynarioid ferns because nine species occur on that island (see table 1). Of these seven were found during a recent trip in Papua New Guinea made by myself in 1983 in cooperation with Mr. J.R. Croft (LAE), Rev. N.E.G. Cruttwell (Goroka) and Mr. R.J. Johns (Unitech, Lae). Visits were made to the... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1984 |
URL: http://www.repository.naturalis.nl/record/533001 |
| |
|
|
| Hennipman, E.; Roos, M.C.. |
| In his introductory statements to 'The Symposium on the Phylogeny and Classification of the Filicopsida' which was held in London, 1972, HOLTTUM, when dealing with 'dubious groups of relationships which would particularly repay investigation', mentioned the Polypodiaceae first (HOLTTUM, 1973: 6). Talking about Polypodiaceae the present authors deal with the Polypodiaceae sensu stricto only, thus excluding the Cheiropleuriaceae, Dipteridaceae, Grammitidaceae, and also the Loxogrammaceae, taxa which were formerly (or are still) included in the Polypodiaceae sensu lato. As delineated in this way, this almost exclusively pantropical family consists of about 600 species and an indefinite number of genera. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/534714 |
| |
|
| |
|
|
| Roos, M.C.. |
| Second Flora Malesiana Symposium — The highlight of the year was the Second Flora Malesiana Symposium. It was organized under the auspices of the Foundation Flora Malesiana (FFM) by Puslitbang Biologi of the Indonesian Institute of Sciences (LIPI) and the Fakultas Biologi of the Gadjah Mada University in Yogyakarta and was held there from 7-12 September, 1992. The Symposium was concluded with four workshops, devoted to Fund raising, Recruitment of new authors, Training and exchange programs, and the Checklist Project respectively. The discussions yielded many valuable suggestions and recommendations (Fl. Males. Bull. 11(1): 97-101). It was announced that the Third Flora Malesiana Symposium will be held at Kew in 1995, preceding the Symposium commemorating... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/533046 |
| |
|
|
| Roos, M.C.. |
| Last year I have reported on the results of a first annual questionnaire sent out to all collaborators in the Flora Malesiana network early 1993, asking information on progress, possible bottlenecks, and the expected date of completion of the manuscript. The present report deals with the results of the second questionnaire, which was circulated early 1994. The response was somewhat lower compared to the first one (c. 80% and 85%, respectively). |
| Tipo: Article / Letter to the editor |
|
| Ano: 1994 |
URL: http://www.repository.naturalis.nl/record/533200 |
| |
|
|
| Roos, M.C.. |
| This symposium volume gives the state of the art in the research on ant-plant interactions. A lot of new data and insights are presented. A thematic grouping of the chapters divides the book into six parts. The first part deals with antagonistic interactions, i.e., the leaf-cutter ants. It appears that leaf-cutters collect a diversity of material, diluting the effect of toxic allelochemicals. They may collect quite inappropriate material; they have been reported to cut and bring back pieces from plastic labels. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/524438 |
| |
|
|
| Roos, M.C.. |
| Anticipating a forthcoming monograph of the subfamily Drynarioideae (Polypodiaceae), six new combinations in Aglaomorpha are made. Apart from full synonymy and descriptions, this monograph will include the phylogenetic systematics of this group. The phylogenetic relationships established lead to the recognition of the holophyletic genera Aglaomorpha and Drynaria only. The generic delimitation of Drynaria is not affected, but Aglaomorpha needs to be emended including all other (mostly monotypic) drynarioid genera. As a consequence, the following nomenclatural changes are necessary. Aglaomorpha latipinna (C. Chr.) Roos, comb. et stat. nov. – Basionym: Holostachyum hieronymi Copel. var. latipinna C. Chr., Svensk Bot. Tidskr. 16 (1922) 96. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/525818 |
| |
| Registros recuperados: 23 | |
|
|
|
