- leaf scars often somewhat pear-shaped
- furrows between the ribs straight, undulating or zigzag
- vertical distance of the leaf scars half the height of a scar to one scar
- lateral angles somewhat sharp
- a clearly-defined line above the leaf scars is mostly present
- two slanting rows of wrinkles ('a split beard') below the leaf scars or wrinkles over the entire width of the ribs.
Click the photo to see more details