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SummaryCtenium bennae Xanthos is described and illustrated as the only rheophytic species in the genus. The new species is known from a single waterfall on the Benna Plateau, at the border between Forecariah and Kindia Prefectures in Guinea Conakry. Ctenium bennae is here assessed as Near Threatened according to the categories and criteria of IUCN.

Trichanthecium tenerium Xanthos, a new species from Guinea-Conakry, is described and illustrated. Trichanthecium tenerium is at present known only from two uninhabited sandstone table mountains in the Kounounkan Massif, Forecariah Prefecture. The species is assessed under the IUCN category Endangered. A key to the annual species of Trichanthecium is provided.

The aim of the research was to investigate the relationship between environmental pollution in Guinea Conakry and the levels of development as well as the assessment of climatic conditions as they influence pollution levels. In order to explore economic, social and cultural situations in Guinea, in-depth interviews were conducted and also face-to-face interviews were recorded. There were observations made in two extreme climatic conditions (dry season and rainy season) that have allowed inference to the impact of climatic conditions on pollution levels.

There is now a burgeoning body of literature which examines the impacts of Ebola in Guinea Conakry, Liberia and Sierra Leone. This analysis, however, has focused predominantly on health issues, emergency preparedness and the international response in all three countries. At the same time, it has grossly overlooked the social and economic impacts of the epidemic. Central to this discussion is the state of alluvial diamond mining, a centrepiece of the rural economies of all three countries. This paper draws attention to this much-neglected area in the policy dialogue on Ebola in West Africa, and identifies priority areas for research moving forward.

Guinea-Conakry has one of the highest plant diversities in Sub-Saharan West Africa and is part of the Upper Guinean Forest ecoregion and the Guinean Forests of West Africa biodiversity hotspot. Guinea is a major supplier of the world’s bauxite and has significant reserves of high grade iron ore, it also has small reserves of diamonds, gold and uranium. As a result large areas of open cast mining exist in the country and pressure on habitats and vegetation are increasing with the need to bring revenue into the country; this is in addition to unsustainable slash and burn agriculture and a growing population. An initial list of 482 species was compiled from Lisowski’s Flore (Angiospermes) de la République de Guinée, subsequent discussion and screening reduced the list to 253. This list has since increased, through new species and range extensions, to 270 which is presented here. It is estimated that c. 7-8% of the countries flora is threatened. Rediscoveries and new species are being made in Guinea, but they are often already threatened having been discovered as part of Environmental Impact Assessments (EIAs). A comprehensive red list of threatened species is much needed to support the country’s environmental policy as well as their international obligations. Data gathering for a Red Data Book for Guinea has been ongoing for several years and is due to be published in 2019.

Drawing on fieldwork conducted over a period of one year in a Malinke village in Guinea, this article aims to develop an understand of the evolution of mining mobilities from a spatial perspective. Artisanal and smallscale gold mining (ASM) has expanded rapidly in Northeastern Guinea since the 1980s. Here, men, women and occasionally, children, work at the gold mines and live in temporary camps during the dry season. However, since the introduction of metal detectors at the end of 2011, mobility has been dominated by men and has become much more random. Men now make numerous trips back and forth to their villages during the dry season, changing mobilities into trajectories. My purpose is to show that, paradoxically, this randomness allows men greater flexibility in managing their presence and absence in their village of origin.

We show that two distinct species have been confused under the name of Tarenna hutchinsonii Bremek. T. hutchinsonii itself appears to be confined to its type location in Sierra Leone (where it is presumed extinct) and to several newly discovered locations in Guinea and Liberia. It has been assessed as Critically Endangered using the 2012 IUCN standard. Material from Ghana and Ivory Coast previously ascribed to T. hutchinsonii is here described as T. agnata Cheek & Lopez Poveda, and assessed as Critically Endangered, although it may well already be globally extinct.

[1] Understanding how extremes are changing globally, regionally, and locally is an important first step for planning appropriate adaptation measures, as changes in extremes have major impacts. The Intergovernmental Panel on Climate Change's synthesis of global extremes was not able to say anything about western central Africa, as no analysis of the region was available nor was there an adequate internationally exchanged long-term daily data set available to use for analysis of extremes. This paper presents the first analysis of extremes in this climatically important region along with analysis of Guinea Conakry and Zimbabwe. As per many other parts of the world, the analysis shows a decrease in cold extremes and an increase in warm extremes. However, while the majority of the analyzed world has shown an increase in heavy precipitation over the last half century, central Africa showed a decrease. Furthermore, the companion analysis of Guinea Conakry and Zimbabwe showed no significant increases.

Las políticas coloniales de fin de siglo XIX son responsables de graves epidemias de la enfermedad del sueño en África Occidental. Poblaciones enteras fueron puestas en contacto con la mosca Tse-Tse acabando así con un equilibrio "natural" histórico-. Tras la independencia, y tras décadas de lucha eficaz contra la enfermedad, la Tripanosomiasis Humana Africana (THA) desaparece. Según la OMS (1996), hoy nos encontramos ante un nuevo contexto en el que se encuentran al menos 300.000 nuevos casos de los que sólo son reportados 25.000. Ante la ausencia de infraestructuras sanitarias y la situación de inestabilidad política de Guinea Conakry y en Costa de Marfil, es imposible disponer de datos fiables. Más que nunca es necesario advertir sobre la diferencia existente entre ausencia de datos y ausencia de enfermedad. Resulta urgente la promoción de métodos de cartografía de riesgos a pequeña escala geográfica como herramientas para el apoyo a la toma de decisiones en materia de atención sanitaria. Tras varias décadas, los satélites civiles de observación terrestre proporcionan imágenes cuya cobertura geográfica y resolución se adaptan bien a esta problemática. A modo de ejemplo, presentamos un método basado en teledetección y análisis espacial para la cartografía de zonas de riesgo de la enfermedad del sueño. El principio adoptado consiste en la conversión de las expresiones espaciales de la enfermedad, identificadas sobre el terreno, en indicadores de paisaje obtenibles de las imágenes., At the end of 19th century in western Africa sleeping sickness - Human African Trypanosomiasis - was responsible for a lot of death in an entire state of complete Disorganisation caused by foreign political intervention. A very large movement of important population modified historical natural equilibrium and humans were in active contact with the disease's vector, the Tse- Tse fly. After independence, in relation with few decades of systematic and efficient sanitary struggle sleeping sickness disappeared. Currently we are in a new context; the disease is reviviscente. In 1996 a WHO report signalled that more than 25,000 new cases in inter-tropical Western Africa were reported. In reality it is believed that probably 300,000 new persons were affected. However, without efficient sanitary structure it is impossible to dispose of true data and to treat population most of which is ineluctably condemned. In that context - aggravated by the political instability - it is an emergency to promote new methods for large scale diagnoses to help sanitary decision rules. From few years ago, spatial resolution and geographical coverage of remote sensing give images of hearth adapted to a smoothness description of landscape on large surface. The method we propose, founded on image analysis and geostatiscal analyses, consists on translating spatial expression of disease identified from field study on environmental risk factors deductible from space imagery. Results consist on probability risk map on large coverage. We hope it will help struggling against disease. Our approach was situated at the level of elementary digit of sickness and their interconnection. Two examples of sickness spatial expression are presented: one in Guinea Conakry and the other in Ivory Coast.

Seeking to understand how humans, by the settlements they create (among other means), influence the operation of the pathogen system of sleeping sickness, the authors performed a diachronic analysis of the landscape and settlement dynamics by comparing topographic maps from 1957, a satellite image from 2004, and georeferenced censuses from 2009 and 2001. It appears that the extreme mobility of the population between the continent and the islands is the principal cause for the continuation of this disease at the mouth of the Rio Pongo.

For English speakers, the collection is a double blessing as this is the first time such a source of information on the French speaking countries is presented to them in their own language. --WEST AFRICA ...a valuable addition to Africanist reference collections. --INTERNATIONAL JOURNAL OF AFRICAN HISTORICAL STUDIES