Crossosoma 34(2), Fall-Winter 2008 
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in June, 1995 and by Thomas H. Nash in March, 1998. In the Lichen Herbarium 
at the Santa Barbara Botanical Garden (SBBG), I examined and revised a small 
selection of Charis Bratt’s collections from San Miguel Island of species not 
collected by Nash, Marsh, or myself and the verified material is included in the 
checklist presented here. Bratt did not collect extensively on San Miguel Island, 
although she made several visits. Overall, the collections from the Channel Islands 
at SBBG have been poorly annotated, with many mis-determinations, and often 
have outdated names that need to be revised. This task extends far beyond what 
I had funds to achieve during this study but should be undertaken in the future 
because it is especially important for the study of the lichen flora of Santa Cruz 
Island where Bratt collected extensively. 
The checklist presented here is preliminary and will be revised as a lichen flora of 
Channel Islands National Park is developed. As a general rule I have excluded any 
previous reports of species that have not been published in the three volumes of 
the Lichen Flora of the Greater Sonoran Desert Region (Nash et al. 2002, 2004, 
2007) because the identifications based on out-dated taxomomy are unreliable. I 
only include them when earlier reports have been confirmed in recent scientific 
literature or where I have personally confirmed them. 
Lichenicolous fungi have not been extensively collected or studied on San Miguel 
Island. A few species are mentioned under their main hosts. 
Corticolous lichens occur on bark or wood, even fence posts, and can be specific 
to certain vascular genera. Saxicolous lichens occur on various rock substrates 
and some species specifically occur on calcareous or acidic substrates. Terricolous 
lichens occur on soil. More information can be found on most species in the three 
volumes of the Lichen Flora of the Greater Sonoran Desert Region which has 
excellent coverage of the Channel Islands (Nash 2002, 2004, 2007) or in the cited 
literature. 
Lecanora carneolutescens on San Miguel Island. Photo: J. C. Lendemer 
