Abstract
SUMMARYWe cultured and sequenced newly collected material ofPercursaria dawsoniiHollenberg et I. A. Abbott, a poorly known epibiont of limpets found along the west coast of North America. Zoospores, parthenogametes, and zygotes exhibited empty‐spore germination, which produced a prostrate system that expanded by stolon‐like development. A dense carpet of initially uniseriate filaments arose from the prostrate system. These upright filaments soon became biseriate proximally and pluriseriate distally, where they were flat, twisted and distromatic for approximately four‐fifths of their length and rarely became hollow in larger individuals. These fronds became fertile distally and released quadriflagellate zoospores and/or biflagellate isogametes. Individual gametophytic fronds were dioecious, and alternated with isomorphic sporophytic fronds. The gametes moved rapidly and often exhibited an unusual side‐to‐side vibration that made them appear like winged insects. Comparisons of 18S rRNA gene and ITS sequences indicated thatP. dawsoniishould be included in the genusBlidingia, family Kornmanniaceae.
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