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Proc. Natl. Acad. Sci. USA, Vol. 94,
pp. 12002-12006,
October 1997
* Harvard University Herbaria, Department of Organismic and
Evolutionary Biology, Harvard University, Cambridge, MA 02138; and
Communicated by Andrew H. Knoll, Harvard University, Cambridge, MA, August 11, 1997 (received for review May 12, 1997)
Homobasidiomycete fungi display many complex fruiting body
morphologies, including mushrooms and puffballs, but their anatomical simplicity has confounded efforts to understand the evolution of these
forms. We performed a comprehensive phylogenetic analysis of
homobasidiomycetes, using sequences from nuclear and mitochondrial ribosomal DNA, with an emphasis on understanding evolutionary relationships of gilled mushrooms and puffballs. Parsimony-based optimization of character states on our phylogenetic trees suggested that strikingly similar gilled mushrooms evolved at least six times,
from morphologically diverse precursors. Approximately 87% of gilled
mushrooms are in a single lineage, which we call the "euagarics."
Recently discovered 90 million-year-old fossil mushrooms are probably
euagarics, suggesting that (i) the origin of this clade
must have occurred no later than the mid-Cretaceous and
(ii) the gilled mushroom morphology has been maintained
in certain lineages for tens of millions of years. Puffballs and other
forms with enclosed spore-bearing structures (Gasteromycetes) evolved
at least four times. Derivation of Gasteromycetes from forms with
exposed spore-bearing structures (Hymenomycetes) is correlated with
repeated loss of forcible spore discharge (ballistospory). Diverse
fruiting body forms and spore dispersal mechanisms have evolved among
Gasteromycetes. Nevertheless, it appears that Hymenomycetes have never
been secondarily derived from Gasteromycetes, which suggests that the
loss of ballistospory has constrained evolution in these lineages.
Evolution
Evolution of gilled mushrooms and puffballs inferred from
ribosomal DNA sequences
,
, and
Eberhard-Karls-Universität Tübingen, Spezielle
Botanik/Mykologie, Auf der Morgenstelle 1, D-72076 Tübingen,
Germany
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