Summary
Cladistic analysis using maximum parsimony was performed on partial sequences of the nuclear-encoded small subunit ribosomal DNA among unitunicate perithecial ascomycetes, “pyrenomycetes”. Two lines of evolution were inferred within the group. Centrum types as described by multiple investigators are mapped onto the gene tree, and the evolution of centrum development is discussed. The evanescent paraphyses of the Clavicipitales and Hypocreales are treated as homologous, whereas, the homology of the centrum pseudoparenchyma described in Diaporthe centrum type versus that described for the genera Melanospora, Ceratocystis and the order Microascales is questioned. The existence of two lineages within the pyrenomycetes argues that parallel evolution involving the formation of the central cavity is an important aspect of centrum development.
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Spatafora, J.W., Blackwell, M. (1994). Cladistic Analysis of Partial ssrDNA Sequences among Unitunicate Perithecial Ascomycetes and Its Implications on the Evolution of Centrum Development. In: Hawksworth, D.L. (eds) Ascomycete Systematics. NATO ASI Series, vol 269. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9290-4_20
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