Abstract
Weissia sharpii is described as a new species, whose type locality is Jefferson County, Tennessee. It is closely allied with W. controversa Hedw. but differs in having a tetraploid chromosome number, n = 26; loosely adhering dark green tufts; broadly lanceolate, acute leaves with loosely inrolled margins; and larger leaf cells which have higher and more variable papillae. The new spe- cies is apparently restricted to limestone and dolomitic substrates and has been found only in cedar-oak bluffs and cedar barrens of southwestern Virginia, Ohio, Tennessee, Kentucky, northern Alabama and Georgia, and southern Missouri and northern Arkansas.
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