<i><a href="https://en.wikipedia.org/wiki/Laminaria" class="extiw" title="w:Laminaria">Laminaria digitata</a></i>.  Cyanotype photogram.
<bdi><a href="https://en.wikipedia.org/wiki/en:Anna_Atkins" class="extiw" title="w:en:Anna Atkins"><span title="English botanist and photographer (1799-1871)">Anna Atkins</span></a>
</bdi>
<i>Photographs of British Algae: Cyanotype Impressions</i> (1843)