Kärnefelt, I., Thell, A., Randlane, T. & Saag, A. 1994. The genus Flavocetraria Kärnefelt & Thell (Parmeliaceae, Ascomycotina) and its affinities. – Acta Bot. Fennica 150: 79–86.

Randlane, T. & Saag, A. 1992. Additional data about the genus Nephromopsis (Lichens, Parmeliaceae). – Mycotaxon 44(2): 485–489.

Randlane, T. & Saag, A. 1993. World list of cetrarioid lichens. – Mycotaxon 47: 395–403.

Randlane, T. & Saag, A. 1998. Synopsis of the genus Nephromopsis (fam. Parmeliaceae, lichenized Ascomycota). – Cryptogamie, Bryol. Lichenol. vol. 19, no. 2–3: 175–191.

Randlane, T. & Saag, A. 2004. Distribution patterns of some primary and secondary cetrarioid species. . – Acta Univ. Ups. Symb. Bot. Ups. 34 (1): 359–376.

Randlane, T. & Saag, A. 2005. Distribution patterns of primary and secondary species in the genus Vulpicida. – Folia Cryptog. Estonica 41: 89–96.

Randlane, T. & Saag, A. 2006. Cetrarioid lichens in Europe – an identification key for the species. In: A. Lackovicova, A. Guttova, E. Lisicka & P. Lizon (eds); Central European Lichens – diversity and threat. Mycotaxon Ltd., Ithaca, pp. 75–84.

Randlane, T. & Saag, A. 2007. Cetrarioid lichens in the southern hemisphere – an identification key and distribution patterns of the species. In: I. Kärnefelt & A. Thell (eds), Lichenological Contributions in Honour of David Galloway, Bibliotheca Lichenologica 95: 489–499.

Randlane, T., Saag, A. & Obermayer, W. 2001. Cetrarioid lichens containing usnic acid from the Tibetan area. Mycotaxon 80: 389-425.

Randlane, T., Saag, A. & Thell, A. 1997. A second updated world list of cetrarioid lichens. The Bryologist 100(1): 109–122.

Randlane, T., Saag, A., Thell, A. & Kärnefelt, I. 1994. The lichen genus Tuckneraria Randlane & Thell – a new segregate in the Parmeliaceae. – Acta Bot. Fennica 150: 143–151.

Randlane, T., Thell, A., & Saag, A. 1995. New data about the genera Cetrariopsis, Cetreliopsis and Nephromopsis (Fam. Parmeliaceae, lichenized Ascomycotina). – Cryptogamie, Bryol. Lichenol. vol. 16, no. 1: 35–60.

Saag, L., Hansen, E. S., Saag, A. & Randlane, T. 2007. Survey of Lepraria and Leprocaulon in Greenland. Mycotaxon 102: 57–90.

Thell, A., Randlane, T., Kärnefelt, I., Gao, X.-Q. & Saag, A. 1995. The Lichen genus Allocetraria (Ascomycotina, Parmeliaceae). In: F. Daniels, M. Schulz & J. Peine (eds); Flechten Follmann. Contributions to lichenology in honour of Gerhard Follmann. University of Cologne, Cologne, pp. 353–370.

Thell, A., Randlane, T., Saag, A. & Kärnefelt, I. 2005. A new circumscription of the lichen genus Nephromopsis (Parmeliaceae, lichenized Ascomycetes). Mycological Progress 4(4): 303–316.

Tõrra, T. & Randlane, T. 2007. Lichen genus Usnea (lichenized Ascomycetes, Parmeliaceae) in Estonia with a key to the species in the Baltic countries. Lichenologist 39(5): 415–438.