Plenasium banksiifolium

Plenasium banksiifolium is a fern in the family Osmundaceae.[1] The genus Plenasium is recognized in the Pteridophyte Phylogeny Group classification of 2016 (PPG I);[2] however, some sources place all Plenasium species in a more broadly defined Osmunda, treating this species as Osmunda banksiifolia.[3] It is native along the Pacific coast of Asia, being found in the Kamchatka Peninsula, the Ryukyu Islands, Japan, southeast China, Taiwan, the Philippines, Borneo, Sulawesi and Java.[3] P. banksiifolium, which can reach a height of 1.5 m, is the largest species in the genus and has ornamental value.[4]

Plenasium banksiifolium
Plenasium banksiifolium
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Osmundales
Family: Osmundaceae
Genus: Plenasium
Species:
P. banksiifolium
Binomial name
Plenasium banksiifolium
(C.Presl) C.Presl
Synonyms[1]
  • Asplenium aureum Blume
  • Nephrodium banksiifolium C.Presl
  • Nephrodium bromeliifolium C.Presl
  • Osmunda banksiifolia (C.Presl) Kuhn
  • Osmunda banksiifolia var.bromeliifolia (C.Presl) Kuhn
  • Osmunda bromeliifolia (C.Presl) Copel.
  • Osmunda haenkeana C.Presl
  • Osmunda oxyodon Miq.
  • Osmunda presliana J.Sm.
  • Plenasium aureum (Blume) C.Presl
  • Plenasium bromeliifolium (C.Presl) C.Presl
  • Plenasium oxyodon (Miq.) A.E.Bobrov
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Description

The appearance of the fertile pinnae are very different from that of the sterile pinnae, the fertile pinnae are curled. The sporangia can also grow on the vegetative pinnae immediately above and below the fertile pinnae, with a compact shape; so we might say that P. banksiifolium has three types of pinnae: fertile, sterile, and semi-fertile. The young opening sterile pinnae are red, the fertile pinnae are mustard yellow at first, then turn green and finally reddish brown. The fertile pinnae can reach more than ten pairs.

  • Sporophylls and vegetative pinnae
    Sporophylls and vegetative pinnae
  • The sporangia on the vegetative pinnae
    The sporangia on the vegetative pinnae
  • Young frond
    Young frond
  • Young frond
    Young frond
  • Vegetative pinnae
    Vegetative pinnae
  • Veinlets forked
    Veinlets forked
  • Rhizome
    Rhizome
  • Plant
    Plant

References
  1. Hassler, Michael & Schmitt, Bernd (August 2019), "Plenasium banksiifolium", Checklist of Ferns and Lycophytes of the World, Version 8.10, retrieved 2019-10-02
  2. PPG I (2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229, S2CID 39980610
  3. "Osmunda banksiifolia Ching", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-10-02
  4. "粗齿紫萁" (in Chinese). iPlant.cn, Flora Reipublicae Popularis Sinicae.


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