Typical mucronatum occurs mostly to the north and east of Ky., perhaps including some bordering counties of Va. (FNA 26; F, PL, W). There are no confirmed records from the state, but there has been confusion with atlanticum and further review is needed. These are both slender plants (stems ca. 1-2 mm wide) with relatively small capsules, but mucronatum differs in its unbranched stems that dry dull greenish (versus branched, drying mostly straw-colored except for the blackish fruit); 2n = 32.