Key: Step 634. Orthocladiinae 46 Propsilocerus

634a. 4th lateral seta of segments III and IV thin and short (less than 100µm long.)

Propsilocerus lusatiensis

634b. 4th lateral seta of segments III and IV thick and longer (over 100µm long).

Step 635. Orthocladiinae 47 Propsilocerus
Decision path