Pseudendoclonium Wille.

Pseudendoclonium possesses the typical Dilabifilum -like packet-forming to filamentous morphology with cells differentiating into prostrate and erect systems (Fig. 26), which makes accurate determination impossible without molecular methods. In addition, these genera often exhibit considerable phenotypic plasticity (Darienko & Pröschold 2017). The genus with 10 accepted species (Guiry & Guiry 2022) includes free-living (mostly marine, sometimes freshwater, terrestrial or aerophytic; Škaloud et al. 2018) and lichen-symbiotic members. Crustose Verrucariaceae lichens, belonging to the genera Hydropunctaria, Verrucaria and Wahlenbergiella are often associated with P. commune, P. arthropyreniae, P. submarinum and P. incrustans (Darienko & Pröschold 2017; Černajová et al. 2022).

Free-living P. commune was isolated from coastal rocks, Snake Island, Ukraine and from a concrete block in the tidal zone on Oakland beach, RI, USA (Darienko & Pröschold 2017). A free-living strain closely related to P. arthropyreniae was cultivated from material collected from stone surfaces of the Borobudur Temple, Indonesia (Purbani et al. 2020). Environmental sequences of P. submarinum, P. commune and P. arthropyreniae were recovered from the littoral rocks of the North Sea and the Baltic Sea (Schmidtová 2022).