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Mycological Progress

, Volume 10, Issue 4, pp 497–517 | Cite as

Taxonomic revision of Endoraecium digitatum (rust fungi, Uredinales) with description of four new species from Australia and Hawaii

  • Reinhard Berndt
Original Article

Abstract

Endoraecium digitatum was described on Acacia notabilis from South Australia but has been reported on more than 20 Acacia spp. throughout the Australian and the Pacific regions. Results are presented on the micro-morphology and taxonomy of E. digitatum from different Acacia species and geographic provenience. E. digitatum revealed a highly non-uniform morphology and is considered a species complex comprising at least six morphologically distinct rust fungi. The name E. digitatum could not be applied to any of the distinguished species by a comparison with available type specimens or the original description as types were depleted and the diagnosis not detailed enough. An epitype is therefore proposed to supplement the lectotype of E. digitatum selected here and to allow delimitation of the new species E. parvum, E. violae-faustae and E. walkerianum from Australia, and E. kauaianum from Hawaii. Endoraecium phyllodiorum is shown to be different from E. digitatum and is proposed as a new combination for Uromyces phyllodiorum. Specimens from Hawaii formerly considered to be E. digitatum represent two species, E. kauaianum and another one preliminarily assigned to E. phyllodiorum. The investigated species show differences between and plasticity within their life cycles. E. parvum, E. violae-faustae and E. kauaianum are macrocyclic. In E. walkerianum, only demicyclic specimens were found, while demi- and macrocyclic specimens occurred in E. digitatum. E. phyllodiorum revealed variable combinations of spore states as well and comprised macro-, demi- and microcyclic life cycle variants. Life cycle variants were considered to express specific variability and were not used to create new taxa. The present results indicate that members of the E. digitatum complex in Australia are not narrowly host specific. Keys are presented for the Australian and Hawaiian species. Taxonomical novelties: Endoraecium kauaianum R. Berndt, Endoraecium parvum R. Berndt, Endoraecium phyllodiorum (McAlp.) R. Berndt, Endoraecium violae-faustae R. Berndt and Endoraecium walkerianum R. Berndt.

Keywords

Acacia Racospermyces Life cycle Epitype Species complex 

Notes

Acknowledgements

I thank John Walker for intensive and helpful discussion and information on the Berlin-type of E. digitatum, Martin O’Leary (AD) for providing localities of Acacia notabilis and selecting rust-infected specimens from the phanerogam collection of AD, Roger Peterson and an unknown reviewer for helpful corrections and suggestions on the manuscript, Roger Shivas (BRIP) for varied help during a stay in Queensland, Graham Bell (AD) for providing work space to study acacias at AD, and Christine and Kálmán Vánky for a specimen of E. walkerianum. Specimens sent on loan from AD, B, BISH, BRIP, K, M, MEL and PUR are gratefully acknowledged. Kate Lloyd (Science Resource Centre, Department for Environment and Heritage Adelaide) is thanked for issuing a collecting permit.

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Copyright information

© German Mycological Society and Springer 2010

Authors and Affiliations

  1. 1.ETH Zurich, Institute of Integrative Biology (IBZ)ZurichSwitzerland

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