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A.-P. de Candolle: une passion, un Jardin

The library will be closed on Thursday 9th November 2017

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6th Global Botanic Gardens Congress

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Court métrage "La Ville célèbre les deux cents ans des CJBG".
Durée: 3'08 minutes

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Dimanche 29 octobre, chasse au trésor au Cabinet de curiosités

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ateliers verts
Ateliers verts

Pour les enfants le mercredi après-midi
Découvrez le nouveau programme !
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Exposition

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Le Jardin, 200 ans de passion
Exposition
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Exposition
Cabinet de curiosités
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Variations Botaniques
Consultez le nouveau programme spécial bicentenaire!
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Sylvain Meyer
artiste en résidence
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Distinction cantonale du développement durable
Distinction cantonale du développement durable
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Projet Arts et Science du bicentenaire
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Sentiers culturels :
la botanique
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La Visite du Jardinier
La "Visite du Jardinier"
Chaque jeudi à 14 heures
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La Feuille Verte
La Feuille verte
dernier n° disponible ici.
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It's blooming in our Garden
It's blooming in our Garden (in french)
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focus podcast Podcast
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ombrage

Conservatoire et Jardin botaniques de la Ville de Genève


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Systematics of the lichen genus Usnea Adans.

The diversity of species, the taxonomy, the chorology, the ecology and the phylogeny of Usnea species is studied, particularly in Europe, Africa, North and South America.

Taxonomy and phylogeny of the Usnea species occuring in the tropical Andes (Bolivia, Colombia, Ecuador, Peru and Venezuela) and the Galapagos Islands, through the study of morphology, anatomy, chemistry, ecology and phylogenetics.

The taxonomy of the lichen genus Usnea in Europe remains poorly known. Numerous species have been described by Josef Motyka in his monograph "Lichenum Generis Usnea Studium Monographicum" published between 1936 et 1938. Environmental conditions can strongly influence the morphology of Usnea species and several of these species are now considered as morphotypes of the same species. Numerous characters used by Motyka in his identification keys are not diagnostic and leads to misleading identifications. This project aims to revise the taxonomy of European Usnea species, by providing detailed description of the species and their full (morphological, anatomical and chemical) intra-specific variation, together with a nomenclatural revision of the synonyms.

Taxonomy and systematics of the lichen genus Usnea in North America, through the study of morphology, anatomy, chemistry, and ecology.

A world checklist of the genus Usnea (Ascomycota, Parmeliaceae) is in preparation. Data on the status of the names (accepted names, synonyms, illeg. Names, etc.), on the protolog, on the type material (locality and herbarium) will be given.