O gênero Puccinia na flona de Caxiuanã, Pará-Brasil

Abstract

The fungi of the genus Puccinia are classified in the family Pucciniaceae, order Uredinales, of the class Basidiomycetes. The Uredinales are known as plant rusts, are ecologically obligate parasites and show high specificity towards their hosts. This work is part of the project "Uredinales of the Caxiuanã National Forest", and aims to carry out a survey, identification and taxonomic studies of species of the genus Puccinia, collected in the area. The species were identified based on macroscopic observations of symptoms, analysis of microstructures and hosts. Freehand sections were made, followed by the preparation of semi-permanent slides, mounted in lactophenol or methylene blue solution with glycerin, to study the sera and spores of each species. Fourteen species of the genus Puccinia were identified, parasitizing 9 host families: P. bambusarum Arthur (Poaceae), P. borreriae Sydow (Rubiaceae), P. flaoo-oirens H. S. Jackson & Holway (Cyperaceae), P. heliconiae Arthur (Heliconiaceae), P. heterospora (Malvaceae), P. buberi P. Hennings (Poaceae), P. insueta Winter (Malpighiaceae), P. minuta Dietel (Cyperaceae), P. negrensis P. Hennings (Poaceae), P.palicoureae Mains, (Rubiaceae), P. paraensis Diete!(Rhamanaceae), P.psidii Winter (Myrtaceae), P. tbaliae Diete! (Marantaceae), P. scleriae (Pazschke) Arthur (Cyperaceae). The species P. fiavo-virens, P. beiiconiae, P. minuta and P. negrensis, are new occurrences for the state of Pará.