16 



bifid or emarginate at apices, standing from roundish erecto-patent 

 axils furnished with minute teeth or processes along both margins, 

 which often grow up into proliferous leaflets. -- Sporangia (isolated) 

 and oogonia densely scattered over both surfaces of the frond. In 

 living state, sub-concentric zones of iridescence are often observed. 



Hab. : On rocks between tide marks near low tide in warmer 

 parts of the country. Okinawa Isl. (Ryukyu), Mogi and Cape Nomo 

 near Nagasaki, Hama-shima (Prov. Shima), Kotsubo (Prov. Sagami). 

 Fruits : summer. 



Remarks : On referring our plants to the present species I have 

 seen neither illustrations nor reliable specimens but references quoted 

 above. 



PL. CIV. Fig. 1 : tetrasporic frond of Dictyota patens }. Ag., \. 

 Fig. 2 : marginal teeth near terminal portion of a branch, -. Fig. 

 3 : cross-section of frond, ~. Fig. 4 : root-fibres emmitted from the 

 surface of the lower attaching portion of frond, \-. Fig. 5 : root- 

 fibres, ". Fig. 6 : portion of branch bearing tetrasporangia, \. 

 Fig. 7 : portion of frond, showing the cells of. the cortex and 

 inner layer and tetrasporangia, -~. Fig. 8: portion of the frond bear- 

 ing oosporangia, 1. Fig. 9 : surface-view of frond bearing oosporic 

 sori ; a, a, those on the under surface, . Fig. 10 : oosporic sori, 

 ^*. Fig. 11 : vertical section of an oosporic sorus, -J-. 



Dictyota Lamour. 1809. 



3) 3> < 3 Jl. 

 DICTYOTACEAE fo & % <* ? &. 



-y 7 m * % $. ft iuj *, * Wi * v, - m ' *ra m 

 * 1- r i& & ' & Jj & ' ^ m ' - m w an * * 



