Sticherus

Else Østergaard Andersen

Gleicheniaceae - Abstracts:

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Flora











Østergaard Andersen, E. & B. Øllgaard 2001. Gleicheniaceae. In: G. Harling & L. Andersson (eds), Flora of Ecuador 66: 105-170. Distributor: Botanical Institute, Göteborg University, P.O. Box 461, SE-405 30 Göteborg, Sweden. ISSN 0347-8742, ISBN 91-88896-26-9. The Ecuadorian species of the Gleicheniaceae are revised. Four genera are recognized, Diplopterygium (1 sp.), Sticherus (17 spp.), Dicranopteris (1 sp.), and Gleichenella (1 sp.). Three species are described as new:  Sticherus arachnoideus Østergaard & B. Øllgaard, Sticherus aurantiacus Østergaard & B. Øllgaard, and Sticherus brevitomentosus Østergaard & B. Øllgaard. One new combination is made: Sticherus melanoblastus (Alston) Østergaard & B. Øllgaard. Keys, descriptions, specimen citations, and illustrations (by E. Østergaard Andersen) are provided for all species.

Østergaard Andersen, E & B. Øllgaard 1996. A Note on Some Morphological Terms of the Leaf in the Gleicheniaceae. American Fern Journal 86(2): 52-57.
The pseudodichotomous branching and variable to indefinite growth in leaves of the Gleicheniaceae cause certain problems of consistency with the descriptive terminology generally used for pinnate fern leaves. These problems are discussed, and a number of terms are recommended in order to reduce ambiguity and inconsistency. These terms are explained and illustrated. 'Segment' refers to the green, undivided portion of the lamina fully adnate to the axis that it is attached to. 'Ultimate branch' is used for the distal, pinnatifid (pectinate), unforked branch that is bearing segments. 'Midvein' is used for the central vascular strand of a segment, whereas 'veinlets' are attached to the midvein. 'Pseudostipules' refer to the modified, stipule-like green segments sometimes borne on the acroscopic side of a pseudodichotomy, protecting the dormant bud. 'Accessory branches' are enlarged and divided segments born basiscopically at the base of branches of pseudodichotomies (only in Dicranoptheris).

More information on Gleicheniaceae
For more information on my collections of Gleicheniaceae see the collections database of Herbarium Jutlandicum (AAU) at Aarhus University and search for Andersen. Type material for S. aurantiacus og S. brevitomentosus can be found in the Herbarium of the Pontifícia Universidad Catolica del Ecuador, Quito (PUCE).











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