| http://www.w3.org/ns/prov#value | - Some problems, however, remain to be resolved, particularly for Selaginella arenicola and S . densa , in which taxa have been recognized at the infraspecific (R. M. Tryon 1955) and specific (L. H. Snyder Jr. and J. G. Bruce 1986; J. W. Thieret 1980; J. M. Beitel and W. R. Buck, pers. comm.) levels.
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