Thelomma carolinianum is distinctive crustose lichen that has been lost from 72% of the total known sites (inferred from a comparison of historical vs. modern (pre-1990 vs. post-1990) occurrence data supported by voucher specimens), together with a 68% loss of Area of Occupancy and 95% loss of Extent of Occurrence. The causes of this reduction are considered to be the large scale degradation and loss of habitat, as well as loss of suitable substrates, throughout the range of the species. These losses have occurred in the past, are ongoing at present at smaller scales, and will likely continue in the future. Therefore, it is listed as Endangered under criteria A2bce+4bce; B2ab(i,ii,iii,v).
Assessor/s: Lendemer, J.; Reviewer/s: Scheidegger, C. & McMullin, T.; Contributor(s): Weerakoon, G.; Facilitator(s) and Compiler(s): Chandler, A. & Allen, J.
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