Nodosilinea

Key to identified species of Nodosilinea , based on morphology

1a. Necridic cells present ......................................................................................................................................................................... 2

1b. Necridic cells absent........................................................................................................................................................................... 3

2a. Filaments typically pseudobranched ......................................................................................................................... N. svalbardensis

2b. Filaments unbranched....................................................................................................................................................... N. nodulosa

3a. Hormogonia present ........................................................................................................................................................................... 5

3b. Hormogonia absent............................................................................................................................................................................. 4

4a. Filaments rare pseudobranched, cells 1.5–6.2 µm long, 1.5–1.7 µm wide, end cell typically elongated ......................... N. bijugata

4b. Filaments unbranched, cells 2–4.5 µm long, 2–2.5 µm wide........................................................................... N. Rehakova 1960/20

5a. Pseudobranching rare, but present................................................................................................................................... N. epilithica

5b. Pseudobranching absent .................................................................................................................................................................... 6

6a. End cells elongated and conical (in mature trichomes)...................................................................................................................... 7

6b. End cells rounded, not elongated and not conical .............................................................................................................................. 8

7a. Cells 2.5–2.7 µm wide.......................................................................................................................................................... N. conica

7b. Cells 1–2 µm wide.......................................................................................................................................................... N. radiophila 8a. Cells (0.8)1–1.5 µm wide................................................................................................................................................................... 9

8b. The wide of cells more than 1.5 µm ................................................................................................................................................. 10

9a. Trichomes and hormogonia immotile, cells 1–2 µm long........................................................................................... N. ramsarensis

9b. Trichomes and hormogonia motile cells 0.6–1.2 µm long..................................................................................... N. chupicuarensis

10a. The long of cells up to 12 µm.................................................................................................................. Nodosilinea sp. FI1-2HA2

10b. Cell no longer than 4 µm ........................................................................................................................... Nodosilinea sp. NB1a-A5