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 strepsilis (Ach.) Grognot (1863: 85) ( Fig. 6d ) Primary thallus persistent, abundant, dominant, forming dense cushions of thick, crenate, and grayish green squamules, esorediate, epruinose; podetia not observed among the Galapagos material. Spot tests and chemistry : P+ yellow; K−; C+ green, KC+ green; baeomycesic acid, strepsilin. Distribution and ecology : New to Ecuador and the Galapagos ; known from Isabela and Santa Cruz Island. The nearest earlier records are from Colombia and Guatemala ( Ahti 2000 ). In Galapagos a rare species, known only from the humid zone; found on the ground, on soil or rock, rarely also as epiphyte. Notes : The distinct cushions of thick, crenate squamules are not easily mistaken for other species of Cladonia and specimens cannot possibly be misidentified because of the conspicuous C+ green spot test reaction caused by strepsilin, a substance not known from any other Cladonia species. Specimens examined : ECUADOR . GALAPAGOS : Isabela Island, Volcán Alcedo , outer SE-exposed slope, ca. 100 m below the crater rim, 0°25’36”S , 91°5’12”W , 1146 m , humid zone, on rock, 6 Mar 2006 , Bungartz, F. 4134 ( CDS 28165) . Santa Cruz Island , eastern slope below the summit of El Puntudo , 0°38’42”S , 90°20’14”W , 780 m , humid zone, on soil, 28 Feb 2006 , Aptroot, A. 64681 ( CDS 31255) .