• Rolla M. Tryon
  • Alice F. Tryon


Stem creeping, small and slender, often branched, nearly protostelic or solenostelic, not indurated, usually bearing trichomes; floating leaves ca. 0.5–2.5 cm long, not circinate in the bud, petiolate leaves without stipules; sori borne on the lobe of a leaf or on a branched leaf, indusiate, with the sporangia stalked, not annulate, the sori either megasporangiate or microsporangiate; heterosporous, spores without chlorophyll. Megagametophyte and microgametophyte minute, partly protruding from the spore wall.


Chromosome Number Living Species Spore Wall Galapagos Island Submerged Leaf 
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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Tests on Variances

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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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