A. W. C. T.  Herre, ?New Lichens and Other Additions to the Lichen Flora of the Philippine Islands?, The Bryologist, vol. 54, pp. 283-290, 1951.

A. W. C. T.  Herre, ?New Lichens from California, New Mexico, and the Philippines?, The Bryologist, vol. 53, pp. 296-299, 1950.