Key: Step 619. Orthocladiinae 31 Brillia

619a. Thoracic horn large, usually emarginate apically (very occasionally rounded), 345-445µm long (m=379µm, n=5) (038f.jpg). Anal fringe of 37-43 taeniae (m=41, n=7) (038h.jpg).

Brillia bifida

619b. Thoracic horn small, narrowed apically to a pointed tip, 135-170µm long (n=4) (038i.jpg). Anal fringe of 59-72 taeniae (n=5).

Brillia flavifrons
Decision path