Hymenophyllaceae

  • Rolla M. Tryon
  • Alice F. Tryon

Abstract

Stem erect to decumbent, small, or usually long-creeping and very slender, sometimes branched, protostelic, more or less indurated, bearing usually short trichomes; leaves small, sometimes minute (2–5 mm), or rarely to 2 m long, entire to pinnate, glabrous to pubescent, thin and lacking stomates, circinate in bud unless very small, petiole without stipules; sporangia borne in marginal sori on a short to elongate receptacle, enclosed by a bivalved to tubular indusium, with a short, ca. 6-rowed stalk, and an oblique annulus not interrupted by the stalk; homosporous, spores with chlorophyll (green). Gametophyte epigeal, with chlorophyll, narrowly thalloid or filamentous, freely branched, sometimes with gemmae, the archegonia borne on the lower surface or in clusters on a filamentous branch, the antheridia with ca. 5 to many cells, mostly on the lower surface or on filamentous branches.

Keywords

Chlorophyll Germinate Flare Cretaceous Mane 

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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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