THE FUCACEJS OF JAPAN. Iü5 



rotutKÜH, apicalihus bifidis, cryptostoniatil)iis mnnerorti.s ; alter lornia 

 radico scutellata rachklc brcvi cyliiidracea doconij)Osito-dichotome rainosa, 

 laciniis iiiferioribus mediisquc cylindraceis vel tereto-angulatis, .sursum 

 tuiuiioribus, apicalibus bifidis, cryptostoniatilnis millis. Frons ox cclUil- 

 ariim duobus stratis constructa, inarticiilata ; cortical! c'elhili.s iiiinoribus 

 aiiticüiKilc (lis[)ositis, cliroinatibus, et intcriori cellulis clonj^atis articu- 

 latis cylindraceis in reticulum densissinunu uudique anastoniosantibu.s, 

 byalinis. Keceptaculis 



Description of the species. This plant is one of the most 

 common algae on the coast of the warmer regions of Japan. It 

 is always found above low-water mark and is exposed to the air 

 during the ebb-tide hours, sometimes lying in intensely hot sun 

 shine and sometimes thoroughly washed by fresh rain water. 



The plant has two forms of an entirely different appearance. 

 One has all its segments, except in the aberrant cases remarked 

 upon below, cylindrical or terete ; while in the other they are flat 

 and leaf-like. I shall call the former the " filiform " type and 

 the latter the " foliose " type, for convenience sake. 



The foliose type has scutellate root a few mm. in diameter, 

 with one or more shoots arising from the same root. The stem 

 is cylindrical, hardly attaining a few mm. in diameter at the 

 base and soon exj^anding into a flabellate frond. The frond ramifies 

 in a regularly dichotomous manner, unless an arm is checked in 

 its development. The axils are wide with the sini round ; hence 

 the appearance of an entire frond is fan-shaped. The segments are 

 linear or linear-cuneate ranging from o mm. to 40 mm. in length 

 and from 3 mm. to 20 mm. in width. Average thickness, ca. 0.6 mm. 

 The apices of the ultimate segments are narrowed and bifid, and 

 have a slit-like depression at each apical point, the longer axis 

 of the depression being parallel to the surface of the segment. 

 Occasionally we find a specimen of this type with an inflated 

 segment containing gaseous matter in it. But the inflation is 



