The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 103, Issue 3, pp 269–282 | Cite as

A morphological study of branch development in mosses with special reference to pseudoparaphyllia

  • Hiroyuki Akiyama


The manner of branch development in mosses was studied. Two types of branch development,Bryum-type andClimacium-type, can be distinguished by their morphology at dormancy. In theBryum-type, the branch primordium does not produce leaves and stays as a primordium at dormancy; the primordium is merely a mass of thin-walled cells with an apical cell. However, in theClimacium-type, the branch primordium produces leaves even in the very early stages of development, and it is a bud accompanied by scale-like leaves that goes through dormancy.

Though pseudoparaphyllia have been considered to originate from epidermal cells of a stem, results of the present study show that they are, whether filamentous or foliose, produced by the branch primordia. TheBryum-type of dormant branch primordium is accompanied by filamentous pseudoparaphyllia in some species, while, that of theClimacium-type is sometimes accompanied by foliose pseudoparaphyllia. Filamentous pseudoparaphyllia are found to be produced adventitiously from the outermost cell layer of a primordium. Developmental mode of foliose pseudoparaphyllia is left for a future survey.

Key words

Branch primordia Morphology Mosses Paraphyllia Pseudoparaphyllia 


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Copyright information

© The Botanical Society of Japan 1990

Authors and Affiliations

  • Hiroyuki Akiyama
    • 1
  1. 1.Department of Botany, Faculty of ScienceKyoto UniversityKyoto

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