ANOTHER VIEW OF FAMILIAL DELIMITATION IN THE HOOKERIALES

Abstract

  The Hookeriales are divided into five families, the Hookeriaceae, Daltoniaceae, Adelotheciaceae, Leucomiaceae and Callicostaceae. The families are delimited primarily on gametophytic characters, including several little-used ones, because the order is considered fairly uniform in peristome features except for a repeatable reduction of cross-striolate to papillose exostome teeth. The order and each family are described and generic inclusions listed. Discussion is presented for controversal genera. A dendrogram is provided to illustrate tentative relationships between the families.