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 Usnea subgracilis Vain. (= U. hesperina Motyka , U. schadenbergiana sensu P. Clerc [non Göpp. & Stein.]) Notes . – Details on this taxon are given in CLERC (1997) , HERRERA CAMPOS et al. (1998) and TRUONG et al. (2013) . In the Canary Islands it was known so far from Tenerife and La Palma (HERNÁNDEZ PADRÓN & PÉREZ-VARGAS, 2010). It is with U. articulata (L.) Hoffm. one of the most frequent pendulous Usnea species on the western Islands of this archipelago. Material examined . – 1 , Er, Boom 45871 , 45881 , 45887 , 45888 ; 7 , Er, Boom 46029 ; 11 , Lr, Boom 46110 ; 16 , Er, Boom 46187 , 46193 ; 24 , Er, Boom 46387/a ; 27 , Er, Boom 46440 ; 57 , Er, P. Clerc G262104 ; 66 , Dahl 841/10b ; 67 , Dahl 844/13b ; 62 , Defago Paroz & Hainard 298232 ; 59 , Hernàndez & Pérez 56614 ; 68 , Krog & Østhagen 3428c ; 69 , Krog & Østhagen 3283d .