Key to the common species of Herposiphonia

1 Determinate branches with more than 20 segments 2
1 Determinate branches with fewer than 20 segments 3
2 Determinate branches up to 3 mm long; pericentral cells 12-14 H. pacifica Hollenberg
2 Determinate branches up to 1.25 mm long; pericentral cells 8-16 H. secunda f. tenella C. Agardh) Ambronn
3 Three determinate branches alternating with 1 indeterminate branch; occasionally a bare node between 2 determinate branches; indeterminate branches up to 130 Ám in diam H. parca Setchell
3 Three determinate branches alternating with 1 indeterminate branch; all segments with a branch; indeterminate branches up to 300 Ám in diam H. crassa Hollenberg

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