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Cyatheaceae

Figs. Cyath. 1–15
  • Rolla M. Tryon
  • Alice F. Tryon

Abstract

Stem usually erect, a single arborescent trunk to ca. 20 m tall, sometimes decumbent and short-creeping, usually massive, rarely small, usually unbranched, dictyostelic with medullary bundles, indurated, bearing scales and sometimes spines; leaves usually large, ca. 2–3 m, sometimes to 5 m long, rarely small, 50 cm or less long, pinnate, or (in Alsophila sinuata) entire, glabrous, pubescent and (or) scaly, circinate in the bud, petiole without stipules; sporangia borne in sori on the abaxial surface of segments, with a low to usually elevated receptacle, exindusiate or the indusium small and scalelike to completely enclosing the sorus, sporangia with a short, 4-rowed stalk and an oblique annulus that is not interrupted by the stalk; homosporous, spores lacking chlorophyll. Gametophyte epigeal, with chlorophyll, obcordate to slightly elongate, somewhat thickened centrally, with multicellular trichomes, archegonia and antheridia borne on the lower surface, the antheridium 5-celled.

Keywords

Chromosome Number Central Portion Cloud Forest Tree Fern Apical Seta 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1982

Authors and Affiliations

  • Rolla M. Tryon
    • 1
  • Alice F. Tryon
    • 1
  1. 1.Harvard University HerbariaCambridgeUSA

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