fathoms), Ursan, Seikoshin. Friuts : spring to summer. 



Length of the frond, breadth of the branches, shape of the tetra" 

 sporic rainuli, habit of the branches and substance of frond much vary 

 according to specimens. Branches are usually very patent, while in 

 others more erect ; in some, breadth of the branches vary according to 

 portions, and broader segments suddenly taper to filiform ones. The 

 variation of breadth of the branches may in some measures be seen 

 from the illustrations given. Tetrasporic sori are mostly formed in 

 spatulately expanded ramuli, while in others in smaller roundish knob- 

 like swollen apices of rafmuli. Substance is firmer in thicker or sub- 

 cylindrical and slenderer frond, and is somewhat membranaceous in 

 thinner and broader ones. The variation of substance originates from 

 the differences of the localities of plants. The present plant grows in 

 more or less sheltered places extending from the midtide to the depths 

 of 5-14 fathoms and those growing in calm places are softer than 

 those growing in the place where tidal currents are in a good flow. 

 As the plant has a very wide distribution in this country the general 

 aspect often so much differs that one may take some of the specimens 

 for a distinct species. 



The alga is perennial and during one year it makes the growth 



of 10-13 cm., though the rate of growth differs according to the con" 



ditions of the environments. In this country the present seaweed is 



argely used as the material of " Knnten " that is well known seaweed 



jelly. 



PL. CVI. Fig. 1 : sterile typical frond of Gclidiuin Amansii 

 Lamour., 1. Fig. 2 : portion of frond, i. Fig. 3 : portion of sterile 

 frond having filiform branches, \. Fig. 4 : portion of tetrasporic 

 frond having broader segments, {-. Fig. 5 : cystocarpic branch, \. 

 Fig. 6 : tetrasporic ramuli, \ 5 . Fig. 7 : cross-section of a tetrasporic 

 ramulus, 9 *-. Fig. 8 : ramuli bearing cystocarps, y. 



