By van den Boom P.P.G.   in Nova Hedwigia

ISSN:0029-5035|76|1-2|157-171

E. Schweizerbart'sche Verlagsbuchhandlung‎(2003)‎

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By van den Boom P.P.G.   Etayo J.   in Lichenologist

ISSN:0024-2829|33|2|103-110

Academic Press‎(2001)‎

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By Coppins B.J.   van den BOOM P.P.G.   in Lichenologist

ISSN:0024-2829|27|2|81-90

Academic Press‎(1995)‎

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By van den Boom P.P.G.   Coppins B.J.   in Lichenologist

ISSN:0024-2829|33|2|87-91

Academic Press‎(2001)‎

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By Giralt M.   Mayrhofer H.   van den Boom P.P.G.   Elix J.A.   in Lichenologist

ISSN:0024-2829|33|2|97-102

Academic Press‎(2001)‎

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By van den BOOM P.P.G.   Alonso F.L.   Egea J.M.   in Lichenologist

ISSN:0024-2829|28|5|395-399

Academic Press‎(1996)‎

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