Abstract
ABSTRACT Two new species of Pucciniales fungi on plants of the Fabid clade are described from samples deposited in the herbarium of Museu Paraense Emilio Goeldi, collected in the state of Amapá, in the Brazilian Amazon. They are Aecidium margaritariae found on Margaritaria nobilis (Phyllanthaceae), and Uromyces amapaensis on Jatropha gossypiifolia (Euphorbiaceae). The microstructures of the specimens were analyzed using optical and scanning electron microscopy. Aecidium margaritariae is characterized by the presence of globose, subglobose to slightly ellipsoid aeciospores with warty walls and smooth areas usually in the basal portion. Uromyces amapaensis is distinguished by the presence of uredinia with paraphyses which are thickened and rounded at the tip, and pedicellate and smooth teliospores. Descriptions, illustrations, and taxonomic comments are presented for each species.
Highlights
In the fungi order Pucciniales, a very specific relationship between the parasitic fungus species and its host plant is observed
About 3,000 species of fungi are reported for the Brazilian Amazon, including those of the order Pucciniales (Basidiomycota), represented by 199 known species causing rust on plants, of which 55 occur in the northern Brazilian state of Amapá (França et al 2010; Carmo et al 2016; Carvalho et al 2018; Furtado et al 2018; Flora do Brasil 2020)
Two new species of rust fungi (Pucciniales) from the Brazilian Amazon: Aecidium margaritariae on Margaritaria and Uromyces amapaensis on Jatropha
Summary
In the fungi order Pucciniales, a very specific relationship between the parasitic fungus species and its host plant is observed. This specificity is a peculiar feature that favors the classic taxonomy of this group of fungi that cause rust in plants. It is used as an aid in the identification of the species, complementing morphological and molecular studies of the different stages of their complex life cycles (Cummins and Hiratsuka 2003; Aparecido and Passador 2009, 2014; Aime et al 2006, 2018).
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