Diplosphaera Bialosuknia .

To date D. chodatii is the only taxonomically accepted species of this genus (Guiry & Guiry 2022). Its globose to ellipsoid cells occur singly or form two- or four-celled packages (Fig. 9) and may be surrounded by mucilage. The chloroplast is cup-shaped, parietal, with regularly arranged thylakoid membranes. Pyrenoids are usually absent. The morphologically similar species Nannochloris normandinae, once taught to be a photobiont of Normandina pulchella (Tschermak-Woess 1988), has recently been synonymized with D. chodatii (Pröschold & Darienko 2020) . The genus Diplosphaera is very difficult to distinguish from Stichococcus based on morphological characters (they differ only in forming two-celled clusters) and the exact delimitation of these two and other related genera was only published quite recently (Pröschold & Darienko 2020). Representatives of this genus are the most common photobionts of lichens in the family Verrucariaceae (Thüs et al. 2011) .