MSA - Systematics/Evolution
Ferrer, Astrid , Miller, Andrew N. , Sarmiento, Carolina , Shearer, Carol, A .
Freshwater Ascomycota: A new lineage within the Pezizomycotina from Costa Rica.
During a survey of freshwater ascomycetes from Costa Rican streams at La Selva, Barra del Colorado and Las Cruces National Park and from lentic habitats in CaĂ±o Negro, we discovered five similar, new and unusual freshwater taxa from the lowland forests. These taxa were reminiscent of Luttrellia (Pezizomycotina, Halosphaeriales) based on the following morphological characteristics: globose to subglobose, membranous, black, ostiolate ascomata; hyaline catenophyses; eight-spored, unitunicate, asci; and hyaline, septate, thick-walled ascospores surrounded by a gelatinous sheath. However, phylogenetic analyses of the newly discovered taxa and the type species of Luttrellia using on 18S and 28S rDNA sequence data indicate these newly discovered taxa do not have phylogenetic affinities with members of the Halosphariales, but rather represent a new lineage within the Pezizomycotina. Luttrellia species possess ascospores that are surrounded by a gelatinous sheath. This type of ascospore modification is uncommon in the Halosphaeriaceae, and might be an important character for the delineation of this new lineage. These new taxa will be described and illustrated and their unique phylogenetic position will be discussed.
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1 - University of Illinois, Plant Biology, 265 Morill Hall, 505 South Goodwin Avenue, Urbana, IL, 61801, United States
2 - University of Illinois, Illinois Natural History Survey, 1816 South Oak Street, Champaign, IL, 61820, USA
3 - Universidad de Los Andes, Departamento de Ciencias Biológicas, Cr. 1a No. 18A-10, Bogotá, Colombia
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood A/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 2:45 PM