TY - JOUR T1 - Studies on the lichens of the Azores. Part 4. The genus Heterodermia JF - Symbolae Botanicae Upsalienses Y1 - 1996 A1 - Moberg, R. A1 - Purvis, O.W. SP - 187 EP - 194 VL - 32 IS - 1 ER -