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Clerc, P. (1997) Notes on the genus
Usnea
Dill. ex Adanson.
Lichenologist
29:
209–215.
Clerc, P. (2004a) Les champignons lichénisés de Suisse. Cryptogamica Helvetica
19:
5–314.
Clerc, P. (2004b) Notes on the genus
Usnea
Adanson. II.
Bibliotheca Lichenologica
88:
79–90.
Clerc, P. (2006) Synopsis of
Usnea
(lichenized Ascomycetes) from the Azores with additional
information on the species in Macronesia.
Lihenologist
38:
191–212.
Clerc, P. (2007)
Usnea
. In: Nash, T. H. III, Gries, C. & Burgartz, F. (eds)
Lichen flora of the
Greater Sonoran Desert Region
. Arizona State University, Tempe, Arizona.
Clerc, P. & Herrera-Campos, M. (1997) Saxicolous species of
Usnea
subgenus
Usnea
(Lichenized
Ascomycetes) in North America.
Bryologist
100:
281–301.
Clerc, P. & May, P. (2007)
Usnea flammea
(Lecanorales) new for North America.
Bryologist
110:
126–128.
Diederich, P. & Sérusiaux, E. (2000)
The lichens and lichenicolous fungi of Belgium and
Luxembourg.
Musée National d'Histoire Naturelle, Luxembourg.
Diederich, P., D. Ertz, D., Stapper, N., Sérusiaux, E. & Ries, C. (2008)
The lichens and
lichenicolous fungi of Belgium, Luxembourg and northern France
. http://www.lichenology.info
Fałtynowicz, W. (1993) A checklist of Polish lichen forming and lichenicolous fungi including
parasitic and saprophytic fungi occurring on lichens.
Polish Botanical Studies
6
: 1–65.
Fos, S. (1998) Líquenes epífitos de los alcornocales Ibéricos. Correlaciones bioclimáticas,
anatómicas y densimétricas con el corcho de reproducción.
Guineana
4:
1–507.
Fos, S. & Clerc, P. (2000) The lichen genus
Usnea
on
Quercus suber
in Iberian cork-oak forests.
Lichenologist
32:
67–88.
Hafellner, J. (2007) Checklist and bibliography of lichenized and lichenicolous fungi so far reported
from Albania (version 05-2007).
Fritschiana
59
: 1–18.
Hafellner, J. & Türk, R. (2001) Die lichenisierten Pilze Österreichs – eine Checkliste der bisher
nachgewiesenen Arten mit Verbreitungsangaben.
Stafia
76:
3–167.
Halonen, P. (1997) The lichen genus
Usnea
in eastern Fennoscandia. II.
Usnea longissima
.
Graphis
Scripta
8:
51–56.
Halonen, P., Clerc, P., Goward, T., Brodo, I. M. & Wulff, K. (1998) Synopsis of the genus
Usnea
(lichenized Ascomycetes) in British Columbia, Canada.
Bryologist
101:
36–60.
Halonen, P., Myllus, L., Ahti, T. & Petrova, V. O. (1999) The lichen genus
Usnea
in East
Fennoscandia. III. The shrubby species.
Annales Botanici Fennici
36:
235–256.
Halonen, P. & Puolasmaa, A. (1995) The lichen genus
Usnea
in eastern Fennoscandia. I.
Usnea
hirta. Annales Botanici Fennici
32:
127–135.