Ptilonia (Harvey) J. Agardh, 1863 is a genus of red algae in the family Bonnemaisoniaceae.
Espécies There are six species: Ptilonia australasica Harvey, 1859 Ptilonia magellanica (Montagne) J. Agardh Ptilonia mooreana Levring, 1955 Ptilonia okadae Yamada, 1933 Ptilonia subulifera J. Agardh, 1890 Ptilonia willana Lindauer, 1947
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