The clear 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 locality forms in my collection and will be offering some of them over the next few years.In this case, it is a collection with green leaf bases from the south of the Bird's Head Peninsula in eastern Irian Jaya.