14 

 between tide marks ; BoshyO. Fruits : late spring to summer. 



Description. Fronds filiform, almost terete creeping on other 

 algae by emitting scutate discs from the under-surface, subdistichously 

 branched in pinnate manner. Main branches alternately pinnated 

 with longer or shorter pinnae which often grow up into similarly 

 pinnated branches of indefinite growth or remain short by making 

 definite growth with alternately arranged longer or shorter teeth-like 

 pinnulae. Main branches are often arranged in somewhat corymbose 



manner. 



Frond has five pericentral cells, throughly ecorticated, of which, 

 two are on the dorsal side and three on the ventral. From every 

 articulation branches are emitted, being spirally inserted in the 

 arrangement of-*- divergence; of thorn, those standing on the dorsal 

 median line and on two longitudinal rows of the ventral side, all 

 of them alternating with five articulations, do not however, develop 

 at all, but remain only one celled. Only those standing along both 

 sides of the frond and somewhat approaching to the dorsal side 

 develop into longer or shoter lateral branches. By latter arrange- 

 ment of the lateral branches dorso-ventral character is weakly 

 represented. All those branches, either growing or rudimental, 

 carry, when young, hair-leaves on apices. Hair-leaves are decom- 

 pound clichotomous and those growing on the branches arising both 

 from the dorsal and ventral surface are of weaker nature than those 

 on the lateral ones. 



Tetrasporangia produced in a slightly differenciated stichidia- 

 likc pinnulae which are somewhat fusiform, slightly swelling in the 

 middle portion. They are arranged in a very slightly twisted and 

 almost longitudinal row, each articulation containing one sporangium 

 and provided with a single disordered row of the remains of hair- 



