Citation: Bj. Coppins et T. Tonsberg, A new xanthone-containing Micarea from Northwest Europe and the Pacific Northwest of North America, LICHENOLOGI, 33, 2001, pp. 93-96
Citation: T. Tonsberg et T. Goward, Sticta oroborealis sp nov., and other Pacific North American lichens forming dendriscocauloid cyanotypes, BRYOLOGIST, 104(1), 2001, pp. 12-23
Citation: D. Fahselt et al., Pigmentation of Cladonia infected by the lichenicolous fungus Arthrorhaphis aeruginosa, LICHENOLOGI, 32, 2000, pp. 300-303
Citation: A. Henssen et T. Tonsberg, Spilonemella, a new genus of cyanophilic lichens with species from North America and Japan (Coccocarpiaceae), BRYOLOGIST, 103(1), 2000, pp. 108-116
Citation: T. Tonsberg, Additions to the lichen flora of North America VII. Some species found on Waadah Island, Washington, BRYOLOGIST, 102(1), 1999, pp. 133-134