@inbook {4217,
	title = {Petractis},
	booktitle = {Lichens of Great Britain and Ireland},
	year = {2009},
	pages = {689-690},
	publisher = {British Lichen Society},
	organization = {British Lichen Society},
	address = {London},
	author = {Seaward, M.R.D. and Aptroot, A.}
}
@article {3772,
	title = {A new species of Petractis (Ostropales s. lat., lichenized Ascomycota) from Wales},
	journal = {Lichenologist},
	volume = {41},
	year = {2009},
	pages = {213-221},
	issn = {0024-2829},
	doi = {10.1017/S0024282909008342},
	url = {http://www.journals.cambridge.org/abstract_S0024282909008342},
	author = {Orange, A.}
}
@article {3352,
	title = {A multigene phylogenetic synthesis for the class Lecanoromycetes (Ascomycota): 1307 fungi representing 1139 infrageneric taxa, 317 genera and 66 families},
	journal = {Molecular Phylogenetics and Evolution},
	volume = {79},
	year = {2014},
	pages = {132-168},
	issn = {10557903},
	doi = {10.1016/j.ympev.2014.04.003},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S1055790314001298},
	author = {Miadlikowska, J. and Kauff, F. and H{\"o}gnabba, F. and Oliver, J.C. and Molnar, K. and Fraker, E. and Gaya, E. and Hafellner, J. and Hofstetter, V. and Gueidan, C. and Ot{\'a}lora, M.A.G. and Hodkinson, B. and Kukwa, M. and L{\"u}cking, R. and Bj{\"o}rk, C. and Sipman, H.J.M. and Burgaz, A.R. and Thell, A. and Passo, A. and Myllys, L. and Goward, T. and Fern{\'a}ndez-Brime, S. and Hestmark, G. and Lendemer, J. and Lumbsch, H.T. and Schmull, M. and Schoch, C.L. and S{\'e}rusiaux, E. and Maddison, D.R. and Arnold, A. E. and Lutzoni, F. and Stenroos, S.}
}
