Urospora Areschoug.

Veselá, Veronika, Malavasi, Veronica & Škaloud, Pavel, 2024, A synopsis of green-algal lichen symbionts with an emphasis on their free-living lifestyle, Phycologia 63 (3), pp. 317-338 : 329

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.

Figures

Figs 19–30. Lichen photobiont genera (including nonlichenized species) belonging to classes Ulvophyceae and Klebsormidiophyceae. Fig. 19. Cephaleuros virescens (Darienko 2017). Fig. 20. Phycopeltis arundinacea. Fig. 21. Trentepohlia sp. Fig. 22. Blidingia marginata. Fig. 23. Halofilum ramosum (Darienko 2008). Fig. 24. Lithotrichon pulchrum (Darienko 2016b). Fig. 25. Paulbroadya prostrata (Darienko 2016a). Fig. 26. Pseudendoclonium sp. Fig. 27. Rindifilum verrucariae. Fig. 28. Undulifilum symbioticum. Fig. 29. Urospora penicilliformis. Fig. 30. Interfilum terricola. Scale bars: 10 μm (Figs 19, 21-30), 50 μm (Fig. 20).