Tephromela atra

Spore Ascus

Thin Section

Thallus

Lichen Index

Spores to the left are immature, a mature one is to the right. Both Tephromela and Lecanora have single celled, hyaline spores of about the same size. Other common genera with single celled hyaline spores in the region are Lecidea, Phyllosora, Parmotrema, Canoparmelia and Pseudoparmelia.