Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Heterojanczewskia stat. nov. with an emendation of generic delineation of Janczewskia(Rhodomelaceae, Rhodophyta)

  • Ki Wan Nam (Department of Marine Biology, Pukyong National University)
  • Received : 2022.07.28
  • Accepted : 2022.09.16
  • Published : 2022.09.30
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Abstract

The vegetative and reproductive morphology of some parasitic Janczewskia Solms-Laubach species including the type species was examined based on specimens collected from various localities around the world. In J. gardneri Setchell et Guernsey on Osmundea spectabilis (Postels et Ruprecht) Nam from California, secondary pit connections are not found between epidermal cells and vegetative axial cells have two pericentral cells. As its host, J. gardneri also has a typical filament type male structure in an apical urn-shaped pit of branches rather than the trichoblast type in other species including the type J. verruciformis Solms-Laubach and tetrasporangial origin of epidermal cells rather than pericentral cells. These significant differences between the species suggest that J. gardneri should be separated from the genus Janczewskia. Based on this morphological data, the section Heterojanczewskia Setchell including J. gardneri, together with an emendation of the generic delineation of Janczewskia, is elevated to the genus level. Relevant nomenclatural changes for some Janczewskia species are also included here.

Keywords

Acknowledgement

I am grateful to Emeritus Professor Y. Saito for providing the specimens of Janczewskia. This work was supported by a Research Grant of Pukyong National University(2021).

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