Recent Topics Posters
Justo, Alfredo , Morgenstern, Ingo , Hallen-Adams, Heather E , Hibbett, David .
Evolution of sequestrate Amanita under Mediterranean climatic conditions.
The systematic position of secotioid (Torrendia) and gasteroid (Amarrendia) forms among the Amanita lineage (Agaricales, Basidiomycota) was studied using molecular (nLSU, ITS) data. Secotioid forms have arisen at least three independent times during the evolutionary history of the group: (i) T. pulchella is a member of section Caesareae with Amanita yuaniana as its closest agaricoid relative; (ii) T. grandis, T. inculta and a new species from Australia are part of an independent clade of uncertain position among subgenus Amanita with no clear agaricoid relatives other than Amanita umbrinella in the ITS dataset; (iii) T. arenaria has its origin in subgenus Lepidella and it's possibly related to sections Phalloideae or Validae. Gasteroid forms have arisen two independent times: (i) Amarrendia oleosa is placed as the sister taxon of T. grandis; (ii) A. grandispora is included in a basal position in sect. Amanitopsis. Mediterranean-type climatic conditions are postulated as a force driving the convergent evolution of these secotioid and at least one of the gasteroid forms in geographically distant areas (Southern Europe and North Africa versus Western Australia).
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1 - Clark University, Department of Biology, 950 Main St. , Worcester, Massachusetts, 01610, USA
2 - Michigan State University, Department of Plant Biology & DOE Plant Research Laboratory, 166 Plant Biology Laboratories, East Lansing, MI, 48824-1312, USA
3 - Clark University, Department of Biology, 950 Main Street, Worcester, Massachusetts, 01610, USA
Presentation Type: Recent Topics Poster
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM