72 



.-14 : m * (4 fl & ftB lft TV" * / ), \ 5 .-15 : 

 16: &m& 



Delesseria crassifolia Rupr. 



Norn. Jap. : Konolianori. 

 PL. CLXVIII. 



Delesseria crassifolia Rupr. Alg. Ochot. p. 232 ; De Toni Syll. Alg. 

 IV. p. 706. Saunders Alg. of the Expedit., 1901. p. 201. Farlow Notes 

 on Arctic Algae, 1886, p. 473. Setchell and Gardner Alg. of New 

 America, p. 322. 



Frond erect, rising primarily from a thin scutate disc which soon 

 lobes into fibrous rhizines as the plant grows in age, 40 cm. high or 

 more, with a thick subcompressed stem (some measures 0.5 cm. in diam. 

 at base in the fresh state), and decompounded by proliferations. Pro- 

 liferations are produced from the midrib and veins on both surfaces. 

 Frond in its early state of growth is a simple oblong veins or obovato- 

 cuneate leaf which becomes lacerated laterally along the veins and pro- 

 liferates similar-shaped leaves as just spoken above. Membranous portion 

 of the primary leaf becomes gradually wasted and thus the midrib is 

 transformed into stem and veins into branches. In this way the plant is 

 more and more decompounded. Leaves are very variable in size and 

 shape, some ovate or oblong, others obovate or elliptical, still others 

 sublanceolate with obtuse apex. Some have the length of 15-16 cm. by 

 breadth of 10, others 3 by 2 ; but 10-12 cm. by 3-5 is more usual. 

 Midrib and veins are usually prominent and veinlets are also more or 

 less evident, but in some they are very weakly provided. Veins are in 

 most cases widely parted forming an angle more than 45 with the midrib. 



