Abstract
Rheophytes are characterized by habitat specificity to streambeds and unique morphology including narrow leaves or leaflets. A broad-leaved form that occurs in regularly flooded streambeds in Borneo was identified as a variant of the rheophytic Tectaria lobbii. It differs from the typical rheophytic form of the species in having broader pinnae, wider angles of lateral pinnae to rachises and of main lateral veins to costae, longer-lobed mesophyll cells, greater intercellular spaces in mesophyll, lower frequency of stomata but similar frequency per epidermal cell, thinner cuticular layers, and fewer epicuticular wax deposits. In all these features the broad-leaved form is similar to other dryland species rather than to rheophytes. Potential usefulness of the form for investigating the evolution of rheophytic stenophylls is noted.
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