Puccorchidium and Sphenorchidium, two new genera of Pucciniales on Annonaceae related to Puccinia psidii and the genus Dasyspora

• Published in: Mycological progress Vol. 14; no. 7; pp. 1 - 13
• Main Authors: Beenken, Ludwig, Wood, Alan R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2015; Springer Nature B.V
• Subjects: Annonaceae; Biomedical and Life Sciences; Ecology; Fungi; Life Sciences; Microbiology; Morphology; Original Article; Phylogenetics; Plant Sciences; Puccinia; Puccinia psidii; Smilacina; Two-celled teliospores; Phylogeny
• ISSN: 1617-416X; 1861-8952
• DOI: 10.1007/s11557-015-1073-8

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.