Key: Step 609. Orthocladiinae 21 Corynoneura

609a. Frontal apotome with distinct tubercles (037e.jpg). (Frontal setae hardly taeniate, about 60µm long; dorsocentral 3 setaceous to barely taeniate, about 50µm long.)

Corynoneura celeripes

609b. Frontal apotome at most with rounded granules, usually more or less smooth.

Step 610. Orthocladiinae 22 Corynoneura
Decision path