Four new species in the lichen genus Diorygma

Four new species of the genus Diorygma, with norstictic and salazinic acid as major compounds, namely D. dealbatum, D. inaequale, D. manipurense and D. verrucirimosum have been described from India. The occurrence of only norstictic and salazinic acid in combination is very rare in Diorygma and so far only one species of Diorygma containing norstictic and salazinic acids has been reported.