Usnea subgracilis Vain.

van den Boom, Pieter P. G., Clerc, Philippe & Ertz, Damien, 2015, New records of lichens and lichenicolous fungi from La Gomera (Canary Islands, Spain), including the new species: Usnea boomiana P. Clerc, Candollea 70 (2), pp. 165-177 : 172

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 .