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Author: J.C. Roskam
In 1964-1965 Herbert Buhr published his ‘Bestimmungstabellen der Gallen (Zoo- und Phytocecidien) an Pflanzen Mittel- und Nordeuropas’. These keys were developed in the great tradition of cecidology in Europe. During the second half of the twentieth century a new generation of cecidologists expanded significantly our knowledge of plant galls and their distribution, about doubling the knowledge known before.

We concentrated on Buhr’s keys, but implemented additions, especially for Southern Europe, from Houard (1908-1913): Les zoocécidies des plantes d’Europe et du bassin de la Méditerranée. The nomenclature of as well gall inducers as host plants has been updated, and information about specific groups of gall inducers has been reviewed and new insights have been given by a team of specialists. To the proxy 9,000 galls and malformations described by Buhr and Houard, we added about 1,250 new galls which have been described in the more recent literature. Moreover, we collected distribution data for total Europe and, if available, adjacent areas.

VOLUME I: Abies-Myrrhis
VOLUME II: Narcissus-Zygophyllum
VOLUME III: References, Plates, Index
Identification Key for Desmidiaceae - Morphology - Ecology and Distribution - Taxonomy
This flora represents the European species of het desmid genera Staurastrum and Staurodesmus and contains reliable identification keys and general information on the morphology, taxonomy, ecology and geographical distribution. An invaluable tool for aquatic ecologists and water quality management.
The desmid genera Staurastrum and Staurodesmus are notorious for their confusing taxonomy and problematic species identification. To a large part this is due to a lack of reliable identification manuals. The present flora, dealing with the European species of these genera, aims to meet this need. As well as general information on the morphology and taxonomy of the genera, identification keys to the species are provided. The discussion of each species includes morphological characteristics, ecology and geographical distribution (also beyond Europe).
As compared to other desmid genera, a large part of the Staurastrum and Staurodesmus species have a euplanktonic way of life. Reliable identification and knowledge of their ecological demands is most important for the assessment of water quality. Many species have a confined geographical distribution, even within Europe. Shifting distribution patterns of those species might be linked to climate change.
Volume 1: Desmids of the Lowlands - Mesotaeniaceae and Desmidiaceae of the European Lowlands
Volume 2: European Flora of the desmid genera Staurastrum and Staurodesmus
The Complete Botanical Watercolours of the 16th-Century Libri Picturati
Drawn after nature presents a vivid and complete picture of a unique historical collection of botanical watercolours. Botanists, art lovers, historians as well as the general public will enjoy this publication of the watercolours, their annotations and their history, but above all their supreme beauty and display of craftsmanship.
For over 300 years, the Preußische Staatsbibliothek in Berlin held a most remarkable collection of botanical watercolours. They were catalogued as part of the library’s illustrated manuscripts, or Libri Picturati. These magnificent works of art, rich in colour and detail, were made in the second half of the 16th century in the southern part of the Low Countries.
In the 1970s the complete set of watercolours had been rediscovered and sparked the interest of historians, art historians and botanists alike. Together they set out to unravel the many secrets still held by the Libri Picturati’s watercolours: who had collected them, and why?
A team of pre-eminent European scientists worked together on these and other intriguing questions surrounding the collection. They unveiled the important role played by the famous Dutch botanist Carolus Clusius, who later founded the University of Leiden’s Botanical Gardens.
Drawn after nature contains accessible and informative chapters on the collection’s history, but most importantly: it brings together all of the original 1429 watercolours and sketches, for the first time in one volume, accompanied by their original annotations.
Mesotaeniaceae and Desmidiaceae of the European Lowlands
Algal species and in particular desmids are important indicators of water quality. Because of their preferential occurrence in vulnerable habitats, desmids lend themselves well to figuring in conservation studies.
The present flora describes all desmid taxa known from the Netherlands and adjacent lowland areas: over 500 species and more than 150 additional varieties. Because of the predominantly cosmopolitan nature of most species the flora may also be of use outside this geographic region.
The enclosed CD-ROM offers general information on desmid biology as well as a selection of species that are discussed in more detail. Ecological data, both on separate species and desmid communities, enable a characterization of the habitat sampled.
Volume 1: Desmids of the Lowlands - Mesotaeniaceae and Desmidiaceae of the European Lowlands
Volume 2: European Flora of the desmid genera Staurastrum and Staurodesmus
The Non-Filamentous Species of Inland Waters
The Netherlands are a small country, characterized by a large diversity of fresh to slightly brackish, oligo- to hypereutrophic stagnant and flowing inland waters. This diversity is reflected in a remarkable richness of phytoplankton species with blue-green algae as an important component.
Identification of phytoplankton frequently brings on serious problems, due to the scarcity of up-to-date floras. This book, written by an acknowledged Dutch phytoplankton expert, presents a new modern approach to the identification of phytoplankton of The Netherlands.
• treats 95 species belonging to 23 genera of non-filamentous blue-green algae in the plankton of Dutch inland waters including one new genus and 15 new species
• nomenclature according to modern insights and in agreement with international rules
• 500 original black-and-white photographs show all the details necessary for light-microscopical identification
• contains an identification key to the species and comparing every species to similar forms
• information on ecology and occurrence in different water types
• relevant literature references