The Family Cladoniaceae (Lecanorales) in the Galapagos Islands Author Yánez-Ayabaca, A. Biodiversity Assessment, Charles Darwin Foundation (AISBL), Puerto Ayora, Santa Cruz, Galapagos, Ecuador, * Corresponding author: F. Bungartz, phone: + 593 - 5 2526146 / 47 ext. 218, fax: + 593 - 5 2527013 ext. 103, email: frank. bungartz @ fcdarwin. org. ec Universidad Central del Ecuador, Quito, Ecuador, email: albayanez 8 @ gmail. com Author Ahti, T. Botanical Museum, Finnish Museum of Natural History, P. O. Box 7, FI- 00014 University of Helsinki, Finland, Author Bungartz, F. Biodiversity Assessment, Charles Darwin Foundation (AISBL), Puerto Ayora, Santa Cruz, Galapagos, Ecuador, * Corresponding author: F. Bungartz, phone: + 593 - 5 2526146 / 47 ext. 218, fax: + 593 - 5 2527013 ext. 103, email: frank. bungartz @ fcdarwin. org. ec Universidad Central del Ecuador, Quito, Ecuador, email: albayanez 8 @ gmail. com text Phytotaxa 2013 129 1 1 33 https://www.mendeley.com/catalogue/f9153903-31d2-31bc-a0c2-f33d3829b86c/ journal article 10.11646/phytotaxa.129.1.1 1179-3163 5085561 Cladonia arbuscula subsp. boliviana (Ahti) Ahti & DePriest (2001: 500) ( Figs. 1c–d ) Primary thallus evanescent; podetia forming cushions, slender, whitish gray, up to 12 cm tall, sparsely branched; branching pattern anisotomic, dichotomous, rarely trichotomous, principal axes easily distinguishable; axils occasionally perforate; tips typically slightly brown; surface ecorticate, barely verruculose; algal clumps (glomerules) often observed on the surface of old podetia; pycnidia with hyaline jelly; apothecia brown. Spot tests and chemistry : P−, K−, C−, KC−, UV−; all Galapagos material examined contains only usnic acid (chemotype II of Ahti 2000 ). Distribution and ecology : Currently known only from a single collection from the humid zone of Isabela Island; forming lichen heaths in sunny, wind- and rain-exposed habitat among ferns ( Pteridium arachnoideum , Pernettya howellii , Lycopodium sp. ). Notes : The species is similar to C. confusa f. bicolor , but that species differs by thinner, more densely branched podetia and a ramification pattern where no principal axes can clearly be distinguished. The axil perforation observed in the Galapagos material of C. arbuscula subsp. boliviana is not mentioned by Ahti (2000) . Selected specimens examined : ECUADOR . GALAPAGOS : Isabela Island, Volcán Alcedo , 1970, Prichard ( H , LSU ), Volcán Sierra Negra , close to the southern crater rim, along the trail to Alemania , 0°51’12.69”S , 91°8’40.5”W , 1055 m , humid zone, on soil, 16 Aug. 2008 , Bungartz, F. 8338 ( CDS 40984) .