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 Abrothallus chrysanthus Stein Notes . – In Macaronesia, this lichenicolous fungus was previously only known from the Azores ( VAN DEN BOOM & ERTZ, 2014 ). It is closely related to A. usneae Rabenh. , but A. chrysanthus has ascospores of 8-10 × 3-4 µm and those of A . usneae are 14-18 × 5-7 µm. Material examined . – 11 , Ju, Boom 46078 ; 27 , Ci, Boom 46423 [all on Usnea ] .