Uredinales (Basidiomycota) da reserva biológica do lago Piratuba e entorno, Amapá, Brasil.

Abstract

Fungi of the order Uredinales are classified in the class Urediniomycetes, in the phylum Basidiomycota. They are obligatory parasites of higher plants, showing a high levei of specificity in their host associations, constituting pathogens organisms known as "plant rust". The objective of this study was to inventory the rusts fungi of Biological Reservation of the Lago Piratuba and border areas, in the Amapa state, Brazil. The species were identified with base in the hosts, symptoms caused in the plants and analyses of the fungai structures accomplished in optic microscopy and in scanning electron microscopy, following specifies techniques. In addition, the specialized literature and comparisons with other specimens deposited in the MG and IAN herbaria were consulted. Twenty three taxa, representative of 11 genera (nine teleomorphs and two anamorphs) were identified. The teleomorph genera were representative of six families of Uredinales, being Phakopsoraceae represented by higher in number of genera and identified taxa. Puccinia was the genus best represented with seven species of rusts. The 38 registered specimens were parasiting 20 genera of plant hosts, distributed in 15 plant families. The family Bignoniaceae had the higher number of genera of hosts, as well as the higher number of taxa of the order Uredinales. The genus Atelocauda and the species Atelocauda incruslans Arthur & Cummins and Chaconia alulacea Juel are new records for Brazil. Phragmidiella higuoniacearum (Dale) Buriticá & Hennen, Prospodium laevigatum J. F. Hennen & Sotão, Puccinia cynanchi Berk. & M. A. Curtis, Puccinia lateritia Berk. & M. A. Curtis, Puccinia peperomiae J. C. Lindq., Puccinia puta H.S. Jacks. & Holw. ex F. Kern, Thurst. & Whetzel, Puccinia spegazzinii De Toni and Aecidium amazonense Henn. are new records for Amapá. Ali the inventoried species are first records for the study arca. KweiUngia divina (Syd.) Buriticá was the first rust fungi registration on Guadua sp. (Poaceae) in Brazil and this is a new host for this rust. Identification key, taxonomic descriptions, illustrations and data of geographical distribution of the studied species are presented.