Mats Thulin – författare

The Dialectica Monacensis, a collection of logical treatises edited by L.M. de Rijk in 1967, has been pivotal in reconstructing the evolution of medieval logic. However, less attention has been given to the accompanying Tractatus Monacenses, preserved in the same singular manuscript. This volume presents the first complete edition of the Tractatus Monacenses and demonstrates that, while not homogeneous, the collection took its final form within the same intellectual environment as the Dialectica Monacensis. The volume argues convincingly that this environment was a German cathedral school around 1230, challenging de Rijk's earlier assertion of an English origin around 1160–1170. Additionally, the volume includes editions of three key texts integral to de Rijk's investigation into the sources of Peter of Spain’s renowned Tractatus: Quaestiunculae super Summam Ignoti, fragments of Summa Ignoti found within the Quaestiunculae, and Summulae Antiquorum. Together with an extensive introduction, these editions lay the foundation for a re-evaluation of the history of terministic logic, offering an alternative to the longstanding framework established by de Rijk.

Pehr Forsskål's Flora Aegyptiaco-Arabica (1775) is a seminal work documenting approximately 660 new species of plants, but its posthumous and flawed editing has led to significant nomenclatural challenges. To address these issues, later botanists sought to honor Forsskål by renaming many of his identified species with eponyms derived from his surname. However, non-Scandinavian scholars frequently struggled with the correct spelling of Forsskål's surname, leading to a proliferation of orthographic variations in these eponyms.Many of these eponyms do not conform to the standardized rules set forth by the International Code of Nomenclature for Algae, Fungi, and Plants (ICN). Recognizing the potential for taxonomic confusion, a systematic review has been undertaken to evaluate the original eponyms attributed to Forsskål and to clarify their current nomenclatural status. This review is critical for ensuring consistency, accuracy, and proper acknowledgment of Forsskål's contributions to botany.

The history of frankincense, starting in ancient Egypt, and the frankincense trees, what is now the genus Boswellia Roxb., is briefly outlined. General remarks are given on phylogeny and dating of the genus, previous taxonomic treatments, authorship and etymology, chromosome number, cotyledons and hypocotyl, cliff-dwelling versus ground-dwelling species, bark, stipules, breeding system and pollination, fruits and dispersal, hybrids, chemistry and uses, conservation, and harvesting and processing of frankincense. According to previously published phylogenies, Boswellia is sister to the Asian genus Garuga Roxb., and the crown group dates back to the mid Miocene. Twenty-four species are recognized in Boswellia, distributed from Mali and Burkina Faso in the west to India in the east, and from Oman and north-central India in the north to northeastern Tanzania in the south. Most species are found in the Horn of Africa region, with the highest concentration (11 species) in the Socotra archipelago (Yemen). A key to the species of Boswellia is provided, as well as distribution maps, illustrations, descriptions, notes on etymology, distribution and habitat, vernacular names and uses, IUCN Red List assessments, taxonomic remarks, and lists of collections, for all species. Boswellia aspleniifolia (Balf.f.) Thulin, comb. nov., based on Odina aspleniifolia Balf.f., B. samhaensis Thulin & Scholte, sp. nov., and B. scopulorum Thulin, sp. nov., are published, all from the Socotra archipelago. The name Boswellia “hesperia” is provisionally proposed for an apparently new species from Socotra, of which only photographs have been available. Fifteen names are lectotypified, and a neotype is designated for B. papyrifera (Delile) Hochst.

The Somalia flora is very rich in comparison with other arid areas in Africa. Published in four volumes, the 'Flora of Somalia' provides the first comprehensive account of all the vascular plants known to occur in the region, and is a foundation stone for all plant related research in the country. The monocotyledon volume. A number of species additional to Volume 1 are included in an appendix. With 4 colour plates and 171 line drawings.