New records of lichens and lichenicolous fungi from La Gomera (Canary Islands, Spain), including the new species: Usnea boomiana P. Clerc Author van den Boom, Pieter P. G. Arafura 16, NL- 5691 JA Son, The Netherlands pvdboom@kpnmail.nl Author Clerc, Philippe Conservatoire et Jardin botaniques de la Ville de Genève, C. P. 60, 1292 Chambésy, Switzerland Author Ertz, Damien Botanic Garden Meise, Department Bryophytes-Thallophytes, Nieuwelaan 38, 1860 Meise, Belgium text Candollea 2015 2015-12-31 70 2 165 177 http://dx.doi.org/10.15553/c2015v702a1 journal article 10.15553/c2015v702a1 2235-3658 5720974 Arthonia dispersa (Schrad.) Nyl. Notes . – Arthonia dispersa is a pioneer and a weak competitor. In Europe, it is widely distributed from boreal to Mediterranean areas ( WIRTH, 1995 ), but not recorded from the British Islands in SMITH et al. (2009) . It was only known from Madeira in Macaronesia ( CARVALHO et al., 2008 ). Material examined . – 37 , Ertz 16226 ; 40 , Ertz 16233 [all on ut ].