Key to the common species of Liagora

1 Plants with single main axes roughly pinnately branched 2
1 Plants mostly subdichotomously branched 5
2 Usually intertidal on open coasts 3
2 Never intertidal 4
3 Plants chalky, the calcification often fractured; usually growing in bands or zones L. albicans Lamouroux
3 Plants soft or gelatinous, calcification close to axial strands (not dispersed), growing isolated or in groups, exposed on benches and shallow tidepools in early Spring L. orientalis J. Agardh
4 Plants robust with diameter of axes and branches within 2-5 mm; cystocarp with lassoes of sterile filaments around the aging carpogonial branch L. samaensis Tseng
4 Plants delicate with diameter of axes and branches less than 1 mm; cystocarp distinguished by involucre of few short sterile filaments, never covering cystocarp L. pinnata Harvey
5 Plants 3-5 cm long, axes about 1 mm thick, closely subdichotomously branched with up to 5 orders of branches, 5-8 mm apart; cystocarps with bisporangia or irregularly cruciately divided sporangia occurring on leeward reef flats throughout year L. perennis Abbott
5 Plants 4-10 cm long, axes usually thicker than 1 mm, branching subdichotomous to irregular, dichotomies of segments not closer than 1 cm apart; cystocarps without irregularly divided carposporangia; occurring commonly in late Spring and Summer 6
6 Plants greyish-pink, slippery, regularly divided throughout, or with elongate naked lower portions topped by densely divided clusters of branches; carporangia small, cystocarp surrounded by elongate very delicate involucral filaments L. ceranoides Lamouroux
6 Plants heavily and continuously calcified, white, axes 2 or more mm thick, all branches reaching a rounded top (corymb); cystocarp with carposporangia single or in chains of two; involucre inconspicuous L. valida    Harvey

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