Abstract
Two-celled puccinioid teliospores are widely distributed in the rust fungi and appear in several independent lineages of the Pucciniales. About 25 genera in 4 families have been described. Species with two-celled teliospores occurring on members of the Annonaceae are described in the genera Dasyspora, Sphaerophragmium, Diorchidium, Puccinia, and Sphenospora. The molecular and morphological investigations from this study show that Diorchidium polyalthiae, Puccinia popowiae and Sphenospora xylopiae do not belong to the genera in which they were originally assigned. Aecidium deightonii was very closely related to S. xylopiae. Two new genera are erected to accommodate these taxa: (1) Puccorchidium, with the two species P. polyalthiae and P. popowiae; and (2) Sphenorchidium, with the two species S. xylopiae and S. deightonii. They form a well-supported clade in the Pucciniales together with the genus Dasyspora, which also occurs on Annonaceae species, and Puccinia psidii the cause of myrtle rust. The type species of the genus Diorchidium, D. woodii, as well as Sphenospora pallida and S. smilacina appeared within the genus Puccinia. The endocyclic species Endophylloides guineensis occurs on the same host and in the same area as S. xylopiae and S. deightonii, but its relationship could not be determined without DNA data. A key for the rust fungi on Annonaceae with two-celled teliospores is given.
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Acknowledgments
The author thanks the curators of B, BPI, K, M, NY, PREM, PC, PUR, S and Z + ZT for loan of specimens. The first author thanks the scientific and technical assistance of the Genetic Diversity Centre of ETH Zurich (GDC), where the molecular part of the study was done. R. Berndt (Zurich) kindly supported the present study funded by the Swiss National Fund (SNF) (project number 135624).
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Beenken, L., Wood, A.R. Puccorchidium and Sphenorchidium, two new genera of Pucciniales on Annonaceae related to Puccinia psidii and the genus Dasyspora . Mycol Progress 14, 49 (2015). https://doi.org/10.1007/s11557-015-1073-8
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DOI: https://doi.org/10.1007/s11557-015-1073-8