Abstract
One hundred nine taxa critical to an understanding of the bryogeography of the In- terior Highlands ofNorth America are grouped according to their probable phytogeographic history. The taxa reinforce the concepts that the Interior Highlands have served as (1) a refugium for boreal, temperate and austral/tropical taxa of the Arcto- Tertiary Geoglora taxa during glaciation of the Pleistocene, (2) as a dispersal center for temperate and tropical taxa to the south and southwest and (3) as a route for the eastern dispersal of many xeric western and southwestern taxa during xeric periods of the Tertiary and Quaternary. Together with the Appalachian Mountains, the Interior Highlands of North America has served as refugium during glaciation of the Pleistocene for boreal, temperate and austral/tropical plants that were members of the holarctic Arcto-Tertiary Geo- flora (Sharp 1939; Crum 1952, 1972; Steyermark 1959; Iltis 1965). In the Ozarkian region (northern half of the Interior Highlands) there are a number of bryophytes more typical of the drier regions of
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