FIGURE 4 in Morphological and phylogenetic characterization of seven species of Vaucheria (Xanthophyceae), including two new species, from contrasting habitats in New Zealand

FIGURE 4. Light micrographs and illustration of Vaucheria borealis reproductive structures (UCVFW6). A. Antheridium with developing oogonia. B, C, F. Single ovoid oogonia with a horizontal beak and an evenly textured, smooth wall and a circinate antheridium; note reddish colouration of mature oogonial pedicel in C, D. Mature antheridium. E. Mature oogonium with characteristic reddish oospore, smooth wall, horizontal beak (arrows). Scale bars = 20 µm.