Tropical and Subtropical Lichens: Diversity and Floristics
Herrera-Campos, Maria A. , Clerc, Philippe .
Shrubby soredio-isidiate species of Usnea in Mexico.
The systematic study of the genus in México is relatively recent and represents a contribution to its understanding around the world, particularly for the delimitation of the diagnostic characters that define its species.
Morphological, anatomical, and chemical characters, as well as the distribution in the country are studied for seven species of the U. subfloridana aggregate (U. diplotypus Vainio, U. fulvoreagens (Räsänen) Räsänen, U. glabrescens (Nyl. ex Vainio) Vainio, U. pacificana P. Halonen, U. praetervisa (Asahina) P. Clerc, U. subfloridana Stirton, and U. wasmuthii Räsänen), two pertaining to the U. lapponica group (U. substerilis Mot. and U. lapponica Vainio). Several related species such as U. flammea Stirton, U. halei P. Clerc, U. trachista Mot., U. hirta (L.) F. H. Wigg., and U. trachista Mot. are included.
Among the species studied, U. wasmuthii exhibits the widest distribution in the country, followed by U. subfloridana, while U. pacificana, U. fulvoreagens, and U. flammeaare present in very few localities.
U. pacificana, U. flammea, and U. glabrescens are first reported for Mexico.
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1 - Universidad Nacional Autonoma de Mexico , Instituto de Biologia, Departamento de Botanica, Apdo. Postal 70-233, Coyoacan, Mexico, D. F., 04510, Mexico
2 - Conservatoire et Jardins Botaniques, Case Postale 60 CH 1292, Chambesy, Switzerland
U. subfloridana gr.
U. lapponica gr..
Presentation Type: Symposium or Colloquium Presentation
Location: Ballroom 2/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 4:00 PM