Key: Step 644. Orthocladiinae 56 Hydrobaenus

644a. Longest fringe taeniae of anal lobes about 80µm long, 3µm wide, irregularly inserted on the lobe, somewhat stiff (especially the short basal ones), giving an untidy 'spiky' appearance (041g.jpg).

Hydrobaenus dentistylus

644b. Taeniae of anal lobes weak, flexible, inserted in a nearly regular row.

Step 645. Orthocladiinae 57 Hydrobaenus
Decision path