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Abstract Detail

MSA - Systematics/Evolution

Fulgenzi, Tara D. [1], Henkel, Terry W. [1], Halling, Roy E. [2], Smith, Matthew  [3], Aime, M.C. [4].

Boletaceae of the central Guiana Shield.

In the western Guyana upland expanses of primary mixed rainforest of arbuscular mycorrhizal (AM) tree species are juxtaposed with monodominant forests of ectomycorrhizal (EM) Dicymbe corymbosa (Fabaceae subfam. Caesalpinioideae). Remote sensing and ground reconnaisance indicate that Dicymbe forests are regionally extensive and are diversity hotspots for EM fungi in the central Guiana Shield. In the Upper Potaro Basin of Guyana we are conducting a multi-year investigation of EM and saprotrophic macrofungal diversity in Dicymbe forests and the surrounding mixed forests, and their ecological significance in these highly contrasting forest types. This work has uncovered > 150 species of EM fungi associated with Dicymbe, doubling the number of EM fungi known from the lowland Neotropics. Ongoing taxonomic work on the EM fungi indicates that >70% are species new to science. Boletaceae are rich at the Upper Potaro site, numbering at least 20 morphospecies in eight genera (Austroboletus, Boletellus, Chalciporus, Fistulinella, Phylloporus, Pulveroboletus, Tylopilus, Xerocomus). Most of these are species new to science but several constitute major range and host extensions for taxa previously described from Amazonia, southeast Asia, or Central and North America. Taxonomic novelties in the Boletaceae and their impact on generic concepts, as well as their ecological roles and biogeographical implications, will be discussed. Additionally, mycosociological and molecular data highlighting the contributions of Boletaceae to the EM fungal community will be discussed.

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1 - Humboldt State University, Biological Sciences, Arcata, CA, 95521, USA
2 - New York Botanical Garden, Institute of Systematic Botany, Bronx, NY, 10458, USA
3 - Harvard University, Farlow Herbarium and Department of Organismic and Evolutionary Biology, 22 Divinity Avenue, Cambridge, Massachusetts, 02138, USA
4 - Louisiana State University, Department of Plant Pathology and Crop Physiology, Baton Rouge, LA, 70803, USA

ectomycorrhizal fungi

Presentation Type: Oral Paper:Papers for Topics
Session: 26
Location: Cottonwood D/Snowbird Center
Date: Monday, July 27th, 2009
Time: 1:30 PM
Number: 26001
Abstract ID:621