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another part of frond, only slightly thickens, expanding and 

 forming a circular or slightly crenate, cohesive disc, and no 

 septation occurs at a short distance from the apex, as it is also 

 the case with other typical tenaculum. Mode of growth of frond 

 is acropetal and the margin is formed by free ends of ramuli. 

 The number of rays of the main veins is 3-5 or more. Cells 

 in the basal portion of frond emit root-fibres which running 

 together downwards form a stem-like process. 



Jnab. On rocks between tide-marks, often in tide-pools. 

 Susaki (Prov. Tosa, Makino), Misaki (Prov. Saga mi, Yendo), 

 Tateyama (Prov. Boshu), Ogasawarajinia (Yatabe) ； eastern coast 

 of Taiwan (Warb., Heydrich). 



Hitherto-known : Isl. Dirk Harteg in Western Australia. 



The genus Rhipidiphyllon has been estaoiished by Heydrich, 

 based on Anadyomene reticulatum As ken., who had done a 

 careful study of the present plant and Anadyomene, especially 

 Anadyomene Wrightii harv, and throughly discussed aboiit the 

 difference between these two genera. Here, I refer our plant to 

 the present genus according to Heydncb's view. On making 

 this referrence, I only resorted to his work cited above, and 

 therefore, I think it better to express, in tnis place, the reason 

 why I have referred our plant to this genus. Our plant may be 

 identical with his. It has main veins and veinlets as illustrated 

 by that author in his Taf. XV. fig. 1. Again, tenaculum which 

 has been described above may be identical with his so-called 

 tenaculum, as it appears from his illustration and description 



given in 1. c. p. 282, " Nach dens el ben Autoren solche vor, 



die nur ausgebuchtet sind, Solche Tcnaculse besitzt 



Rhipidiphyllon." Murray and Boodle state that the similar ad- 



