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Aime, M.C.; McTaggart, A.R. 2020: A higher-rank classification for rust fungi, with notes on genera. Fungal Systematics and Evolution 7(1): 21-47.

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Aime, M.C.; McTaggart, A.R. 2020: A higher-rank classification for rust fungi, with notes on genera. Fungal Systematics and Evolution 7(1): 21-47.
10.3114/fuse.2021.07.02
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Notes: Two rust fungi with cupulate aecia on Agathis spp., formerly placed in the form-genus Aecidium, belong here. Our analyses consistently place these in a lineage separate from all other sequenced Pucciniales (Fig. 1). Despite over a decade of sampling rust fungi from Australia and Southeast Asia on hosts co-distributed with Agathis species, we have been unable to locate a telial state for these rusts. Peterson (1968) ruled out the possibility that Araucariomyces represents an endocyclic form, because aeciospores of Ar. balansae germinate to produce germ tubes rather than basidia. As is conjectured with Rogerpetersonia, the life cycle may not produce a sporothallus, and instead has adapted to systemically infect their hosts possibly including a cryptic sexual or parasexual cycle.
Notes: Skierka species are tropical and autoecious (Mains 1939c, Cummins & Hiratsuka 2003). All sori are subepidermal and deep-seated; non-catenulate teliospores are extruded in hair-like columns. Skierka has long held an isolated placement laced Skierka in a separate subfamily or tribe, respectively, in the Pucciniaceae; Cummins & Hiratsuka (2003) treat it as incertae sedis within the rusts. Mains (1939c) hypothesised that Skierka represented an intermediate taxon between the Melampsoraceae and Pucciniaceae (equivalent to the subordinal ranks Melampsorineae and Raveneliineae/Uredinineae, under the present classification), a position largely congruent with our placement.

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6484c802-bab5-401f-ae68-f9f5a1e80a34
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31 May 2021
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