here are some shots of lichen that is living most time under water:
- Habitus. Thallus 15 - 35 mm, lobes slightly curved with a single holdfasts, green when wet, greybrown when dry. Undersidedarkbrown, smooth with thin brown veines. Perithieciae numerous, Spores 19 x 6 µm, simple, ellipsoid. Chemistry: J-. On siliceous rocks at often inundated places like brooksides or dripping rocks.

- Underside

- Cross section lobe and perithecium. Oblique illum.

- stained with cotton blue:

- Red chlorophyll autofluorescence of the photobiont

- Perithecium. Closeup spores and asci, stained with cotton blue
