- Halymenia megaspora E.Y. Dawson
Allan Hancock Pacific Exped. 17: 272, pl. 3: figs. 26-28; pl. 14: fig. 58.
Type locality: Mexico: Baja California: bay adjoining Punta Frailes
[Dawson cites AHF 59313 as the holotype, but that sheet is in conflict with other data; the AHF sheet number is 59210]
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