COENOGONIUM-MISSOURIENSE, A NEW LICHEN SPECIES FROM MISSOURI

The filamentous microlichen Coenogonium missouriense sp. nov. (Coenogo niaceae, ascolichens) is described from the wet walls of a dimly lit d olomite cave in Missouri. The highly characteristic pastel green filam ents are long, profusely branched, and 7-13 mum wide. The phycobiont, Physolinum monilia (De Wildem.) Printz (Trentepohliaceae, Chlorophyta) , is tightly corticated by a flattened single layer of laterally adher ent hyaline fungus cells. Hyaline ovate spores with walls covered by s hort spines occurred in groups of about eight near the mycobiont.