title: Microcyclic rusts of hollyhock ( Alcea rosea ).
abstract: Rust fungi infecting hollyhock and other plants in Malveae are frequently intercepted at ports of entry to the USA, particularly Puccinia malvacearum and P. heterogenea. These two species can be difficult to distinguish and can be further confused with other, less common species of microcyclic rust fungi infecting hollyhock: P. heterospora, P. lobata, P. platyspora, and P. sherardiana. Molecular phylogenetic analysis revealed that P. malvacearum and P. heterogenea are closely related, along with P. sherardiana and P. platyspora. A key to the six microcyclic Puccinia species infecting hollyhock is presented.
authors.affiliation: USDA-ARS, Systematic Mycology and Microbiology Laboratory, Beltsville, MD 20705, USA;
authors.forename: Jill E
authors.initials: JE
authors.lastname: Demers
authors.affiliation: USDA-APHIS-PPQ-National Identification Services, Beltsville, MD 20705, USA.
authors.forename: Megan K
authors.initials: MK
authors.lastname: Romberg
authors.affiliation: USDA-ARS, Systematic Mycology and Microbiology Laboratory, Beltsville, MD 20705, USA;; Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Castlebury
keywords: Puccinia; Pucciniales; identification; pathogen interceptions; taxonomy