Key to the species of Chaetomorpha

1 Filaments with distinct basal cell. longer (to 9 mm) than cells above; filaments mostly more than 400 Ám wide C. antennina
1 Filaments attached or free-floating in tufts or strands, basal cell, if present less than 1 mm long 2
2 Cells in upper portion 250 - 600 Ám diam., tending to be isodiametric C. aerea
2 Cells mostly (65) 80 - 100 Ám diam., tending to be longer than wide C. capillaris

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