title: Tranzschelia in the Americas revisited: two new species and notes on the Tranzschelia thalictri complex.
abstract: Two new species of Tranzschelia (Pucciniales) are described from the Americas. Tranzschelia pseudofusca is a microcyclic species on Anemone spp. (Ranunculaceae) with North American distribution. T. mexicana on Prunus salicifolia (Rosaceae) is found in Colombia, Ecuador and Mexico. It is assumed that T. mexicana is a macrocyclic host-alternating species. T. thalictri, a holarctic microcyclic species, has variable morphology and probably is an aggregate of related species. Specimens are documented with scanning electron microscopy (ESEM) and light microscopy including a simple new technique to illuminate urediniospore germ pores. Results are discussed with respect to similar species, distribution and life-cycle characters. A key for American species on telial hosts is provided.
authors.affiliation: Staatliches Museum für Naturkunde Karlsruhe, Abteilung Biowissenschaften, Erbprinzenstr. 13, 76133 Karlsruhe, Germany scholler@naturkundeka-bw.de.
authors.forename: Markus
authors.initials: M
authors.lastname: Scholler
authors.affiliation: Department of Botany, Iranian Research Institute of Plant Protection, P.O. Box 1454, Tehran 19395, Iran.
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Abbasi
authors.affiliation: Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Friedrich
mesh_terms: D000569:Americas; D001487:Basidiomycota / Q000145:classification / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification*; D008969:Molecular Sequence Data; D010935:Plant Diseases / Q000382:microbiology*; D027861:Prunus / Q000382:microbiology*; D013172:Spores, Fungal / Q000254:growth & development
keywords: Anemone; Prunus; Pucciniales; T. mexicana; T. pseudofusca; Tranzschelia arthurii