PLATE X. 
Fig. 1 
Fig. 2 
Fig. 3 
Fig. 4 
Fig. 5, 
Laminaria longissima n. sp. 
Habit of a fertile plant from Kombumori, Prov. Kushiro. x 0.16. 
Cross section through the upper part of the stipe, x 1.6. 
Cross section through the lower part of the stipe, x 1.6. 
Cross section through the upper part of the blade, x 0.8. 
Cross section through the basal part of the blade, x 0.8. 
