Shaw, Shane , Ranker, Tom A. .
New and Improved Leaf Terminology for Gleicheniaceae.
The majority of ferns have determinate leaf ontogeny, which makes them suitable for a hierarchal system of leaf terminology to describe gross morphology. Gleicheniaceae are unique among the fern families because the majority of the species have both indeterminate leaf growth and pseudodicotomously branching leaf development. These two types of leaf development render the hierarchal system of leaf terminology nonsensical. Therefore, Holttum (1957), Tryon (1960), Tryon and Tryon (1982), Lellinger (1989, 2002), and Andersen and Ollgaard (1996) developed specialized leaf terminology to describe the morphology of Gleicheniaceae leaves. Although each system describes the morphology of the leaf adequately, each author coined their own leaf terms or used a different meaning for similar terms (i.e. Tryons’ 1960 ultimate segment does not equal Lellinger’s 1989 ultimate segment); thus, comparisons between different Gleicheniaceae treatments are cumbersome and confusing. To reduce confusion and simplify Gleicheniaceae leaf terminology, I propose a new leaf terminology system that is: 1) universal to all taxa in Gleicheniaceae, 2) will be more useful to use on partial leaf herbaria specimens, and 3) clarifies the ambiguity of having multiple leaf terminology systems.
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1 - University of Hawaii at Manoa, Department of Botany, 3190 Maile Way, Room 101, Honolulu, HI, 96822, USA
2 - University of Hawaii at Manoa, Department of Botany, 3190 Maile Way, Room 101, Honolulu, HI, 96822, USA
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM