The separation of Myrmecodia erinacea and alata is very difficult to impossible. Normally, M. erinacea has rather narrow leaves with wavy leaf margins and an uneven, quasi-embossed leaf surface, while M. alata has rather broad, smooth and unwavy leaves.
However, it is almost impossible to separate them in some collections. I have numerous localised forms in my collection and will be offering some of them over the next few years.In this case, it is M. erinacea with long and narrow leaves, which originates from the area near Nabire.