final HashMap<String, PhylogenyNode> speciestree_ext_nodes = new HashMap<String, PhylogenyNode>();
if ( _species_tree.getFirstExternalNode().isRoot() ) {
speciestree_ext_nodes.put( _species_tree.getFirstExternalNode().getNodeData().getTaxonomy().getIdentifier()
final HashMap<String, PhylogenyNode> speciestree_ext_nodes = new HashMap<String, PhylogenyNode>();
if ( _species_tree.getFirstExternalNode().isRoot() ) {
speciestree_ext_nodes.put( _species_tree.getFirstExternalNode().getNodeData().getTaxonomy().getIdentifier()