168 postelsia 



that he invariably applied the brake. 

 In the mouth of Hakalau stream a 

 Stigeoclonium grew attached to pebbles. 

 It was said that the Hawaiians used it 

 for bait for mullet, which would bite at 

 no other substance. Some fine desmids 

 were also gathered from cliffs under 

 dripping water in Hakalau gulch. Far- 

 ther on, at Laupahoehoe, some dark 

 brownish globules, Nostoc thalli, were 

 picked off the mosses on wet cliffs. On 

 these cliffs were also found a dark blue 

 skin, a Cylindrospermum, and a gray 

 slimy coating which proved to be Glceo- 

 capsa quaternata. At Kukuihaele, where 

 the Pacific sugar mill is located, we 

 made a stay of several days. From 

 here we explored the lovely Waipio 

 valley and the mountain streams. In a 

 taro patch was found Anabcena varia- 

 bilis, some Char a and diatoms. A 

 memorable trip was our horseback ex- 



