PLATE XXIV. 
Alaria corrugata n. sp. 
Fig. 1. Habit of a plant from Shana Gun, Etorofu Isl., Kuriles. 
Fig. 2. A mature sporophyll. x 0.8. 
Fig. 3. Cross section through the midrib of the blade, x 1.6. 
x 0.13. 
