Abstract
Cecropia adenopus (Ambay pumpwood) is a frequent native species on the edges of woods and clearings and is considered a pioneer species in re-colonized areas. Despite its distribution from Mexico to Argentina, this substrate has never been examined in detail regarding the presence of Myxomycetes. In the present study, the myxobiota associated with leaf debris of C. adenopus was investigated in two Atlantic Rainforest conservation units located in the Brazilian state of Rio Grande do Norte. Five specimens and one plasmodium were obtained directly from the field and 87 were developed in 43.7% of 200 moist-chamber cultures set up separately with blades and petioles. Fifteen species were identified and illustrated. The two predominant groups were representatives of Trichiales and Physarales. Didymium columella-cavum was recorded for the second time in Brazil and in the world.
Highlights
Myxomycetes are not considered phytopathogenic organisms (Agrios 1997; Nieves-Rivera 2000), but records are found in the literature regarding their occasionally harmful presence on some plant species of economic importance, such as living trunks of Acer rubrum L. (Ostrofsky & Shigo 1981), the terminal buds of Paulinia cupana Kunth. (Pereira 1984), and stems and leaves of Solanum lycopersicum L. (Cavalcanti et al 1985; Cabrera-de-Alvarez et al 1993), Fragaria sp. (Metlitskii et al 2001), Allium cepa L. (Wordell Filho 2006), Lactuca sativa L. and Petroselinum sp. (Silva & Bezerra 2005).A number of studies have addressed the association of myxomycetes with phanerogam families, genera and species, such as living or decomposing palm trees (Mobin & Cavalcanti 1998/1999; 2000; Cavalcanti & Mobin 2004; Stephenson 2003) and species of Quercus L. (Wrigley de Basanta 1998), Rizophora L. (Stephenson 1988) and Terminalia L. (Bezerra & Cavalcanti 2007)
A number of studies have addressed the association of myxomycetes with phanerogam families, genera and species, such as living or decomposing palm trees (Mobin & Cavalcanti 1998/1999; 2000; Cavalcanti & Mobin 2004; Stephenson 2003) and species of Quercus L. (Wrigley de Basanta 1998), Rizophora L. (Stephenson 1988) and Terminalia L. (Bezerra & Cavalcanti 2007)
Some of these studies have been conducted in northeastern Brazil with introduced species employed in urban tree-planting programs or native species found in different ecosystems
Summary
Myxomycetes are not considered phytopathogenic organisms (Agrios 1997; Nieves-Rivera 2000), but records are found in the literature regarding their occasionally harmful presence on some plant species of economic importance, such as living trunks of Acer rubrum L. (Ostrofsky & Shigo 1981), the terminal buds of Paulinia cupana Kunth. (Pereira 1984), and stems and leaves of Solanum lycopersicum L. (Cavalcanti et al 1985; Cabrera-de-Alvarez et al 1993), Fragaria sp. (Metlitskii et al 2001), Allium cepa L. (Wordell Filho 2006), Lactuca sativa L. and Petroselinum sp. (Silva & Bezerra 2005).A number of studies have addressed the association of myxomycetes with phanerogam families, genera and species, such as living or decomposing palm trees (Mobin & Cavalcanti 1998/1999; 2000; Cavalcanti & Mobin 2004; Stephenson 2003) and species of Quercus L. (Wrigley de Basanta 1998), Rizophora L. (Stephenson 1988) and Terminalia L. (Bezerra & Cavalcanti 2007). & Schwein.) Fr. Hemitrichia pardina (Minakata) Ing Lycogala epidendrum (L.) Fr. Perichaena chrysosperma (Curr.) Lister Perichaena depressa Lib. Physarum melleum
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