Freshwater lichen headache #1

Freshwater lichen headache #1

Observation - Freshwater lichen headache #1 - UK and Ireland. Description: Near disused lead mine on siliceous rock in splash zone within stream. Probably regularly immersed. Thallus crustose, green (both wet and dry), C+ red (fleeting), K-; apothecia lecanorine, red-brown, approx. 0.3-0.4mm at maturity, margin becoming excluded

Near disused lead mine on siliceous rock in splash zone within stream. Probably regularly immersed. Thallus crustose, green (both wet and dry), C+ red (fleeting), K-; apothecia lecanorine, red-brown, approx. 0.3-0.4mm at maturity, margin becoming excluded; photobiont chlorococcoid; asci 8-spored; ascospores simple, ellipsoid to ovoid, colourless, mostly with a single large oil globule, c. 17-20 x 9-10μm in water; paraphyses branched and anastomosing.