Psilotaceae Kanitz

Genera 219, 220
  • Alice F. Tryon
  • Bernard Lugardon


A family of two usually epiphytic genera—Psilotum, pantropical, and Tmesipteris, in western Malesia and the Pacific. The spores are elongate-ellipsoidal and monolete with a low, irregularly rugate to somewhat verrucate surface. The sporoderm is largely formed by a three-layered exospore with the outer layer forming the slightly undulate surface. The thin perispore conforms to and fills the surface depressions in the exospore. Development of the exospore in a centrifugal direction and structural similarities with fern spores support the relationship of the family with the Filicopsida. However, the large synangia, rootless condition, and differences in shoot morphology distinguish the Psilotaceae from other filicalean families.


Ploidy Level Spore Wall Mature Spore Tree Fern Surface Depression 
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Copyright information

© Springer-Verlag New York Inc. 1991

Authors and Affiliations

  • Alice F. Tryon
    • 1
  • Bernard Lugardon
    • 2
  1. 1.Herbarium, Department of BiologyUniversity of South FloridaTampaUSA
  2. 2.Biologie VégétaleUniversité Paul SabatierToulouseFrance

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