APTROOT, A. & H. SIPMAN. 1989. New lichen records from the Philippines. Acta Bryolich. As. 1: 31-41. — 43 taxa, many wide spread and common, indicating the very incomplete knowledge of this group in the Philippines. STREIMANN, H. & H.J.M. SIPMAN. 1994. New lichen records from the island of New Britain in Papua New Guinea. Fragm. Fl. Geobot. 39: 369-382, illus. — New records for 33 gen, 56 spp.