Urospora Areschoug.

This marine alga Urospora forms thalli consisting of slender, unbranched, uniseriate filaments composed of multinucleate cells (Fig. 29), that attach to hard substrates with a multicellular rhizoidal holdfast. The life cycle involves a codiolum-phase that develops from a zygote. Urospora reproduces asexually by four-flagellated zoospores and sexually by biflagellate gametes (Hanic 2005). Interestingly, this macroscopic genus was recently recorded as a Verrucariaceae photobiont (Černajová et al. 2022; Schmidtová 2022). Schmidtová (2022) obtained environmental sequences, identical to Urospora sequences from Verrucaria lichens, and from littoral rocks in the North Sea and the Baltic Sea.