THE AUTOECIOUS SPECIES OF PUCCINIA ON HELIANTHEAE IN NORTH AMERICA

摘要

Sixty-two taxa are recognized in this study of the species ofPucciniacompleting their life cycle on Heliantheae. Six new species are described:Puccinia guatemalensisParmelee onZexmeniaspp. andWedeliaspp.,P. ghiesbreghtiiParmelee onWedelia ghiesbreghtii,P. abramsiiParmelee onGeraea viscida(=Encelia viscida),P. chloracaeParmelee onViguieraspp.,P. calanticariaeParmelee onViguieraspp., andP. praetermissaParmelee onLagasceaspp. Six new varieties are recognized:Puccinia electraevar.robustaParmelee andP. electraevar.depressiporosaParmelee onZexmenia brevifolia, P. caleaevar.cuernavacaeParmelee onCaleaspp.,P. cognatavar.echinulataParmelee onVerbesinaspp.,P. cognatavar.fraseriParmelee onViguiera fraseri, andP. affinisvar.triporosaParmelee onViguieraspp. Three taxa have been restored from synonomy underP. abrupta, viz.P. subglobosa,P. ximenesiae, andP. affinis, the last two parasitic onVerbesinaspp., the first onRhysolepis(=Viguiera).P. tithoniae, P. nanomitra, andP. ordinata, are reduced to synonomy withP. enceliaevar.enceliae, P. iostephanes, andP. melampodiirespectively. New combinations include:P. enceliaevar.aemulans(Syd.) Parmelee andP. abruptavar.partheniicola(Jacks.) Parmelee. A key based on uredinial and telial characters, others based initially on the hosts, and a host index are provided. Each taxon is illustrated by a photomicrograph from type material. Distribution and host extensions, supplementary to those given in Arthur'sManual of the Rusts, are indicated.