Key: Step 651. Orthocladiinae 63 Zalutschia

651a. Postero-lateral corners of segment VIII with an embedded spine (040i.jpg).

Step 652. Orthocladiinae 64 Zalutschia

651b. Postero-lateral corners of segment VIII without an embedded spine.

Step 655. Orthocladiinae 67 Zalutschia
Decision path