Coastal cliff on Santa Cruz Island, Channel Islands, California, USA covered with Niebla spp. Xanthoria, Ramalina and Teloschistes on a branch of Fouquieria diguetii Cladonia pyxidata agg. Caloplaca ignea Heterodermia ciliatomarginata Leptogium rugosum Lobothallia alphoplaca Boojum Tree (Fouquieriea columnaris) in Baja California, Mexico densely covered by lichens Niebla homalea and Tephromela nashii Caloplaca thamnodes Xanthoparmelia sp. Boulder in the Sonoran Desert with several different lichen species, including Candelina submexicana, Caloplaca subsoluta and Xanthoparmelia sp.