How did Baiera leaves differ from Ginkgo leaves?

In the context of the ginkgophyte division, the fossil genus Baiera is distinguished from the living Ginkgo by specific morphological differences in its foliage.

While Ginkgo leaves typically feature a fan-shaped blade attached to a leaf stalk (petiole), Baiera leaves are characterized by two primary differences:

• Lack of a stalk: Unlike Ginkgo leaves, Baiera leaves lack a petiole.
• Lobe structure: Baiera leaves are deeply lobed into four distinct segments.

In contrast, Ginkgo leaves exhibit a range of variation in lobing, often appearing bilobed or undivided, and possess a distinct petiole that supports the dichotomously veined blade.1