204 



BOTANICAL MAGAZINE. 



Vol. XVI, 



he enumerated iu the sect, hugulosa?. 1. c. p. 3. Among the forms, a 

 pinnata is young one, l>. flalellala an aberrant i'..rm, and c. elongata the 

 genuine and typical of £'CA\ hlcijcUs. cf, PI. XVII F.— XX. 1. c. The phint 

 figured in Fl. XV under the name of 1 hevis a latipenna is a form of 

 species probably not yet fully described ; and those in PI. XVI and XVII 

 (7 Iceve h, c. and d) are forms of Ech. cava, Kjellm. De Toni mentioned 

 them all in Sylloge Algarum as forms of Eclc. radiafa (Turn.) J. Ag. 

 sayinfy 'i plur. variet. et form., unde species quara maxirne coUectitia :'"^ 

 and in Phyc. Japon. nova?, ho referred them to Ecl\ hicydis, Kjellm.-' 



The description of Eisenid arhoria, given by Setchell, as above stated, 

 is exactly applicable to our Evl: bicyclis, Kjellm. except minor points. 



The branches at both sides, according liiin. '' sometimes reach a length 

 of 30. cm. or even perhaps exceed it,"^' In Eck. bicyclis, however, even 

 in full grown plant they measure about 20 cm. or little more. In some cases 

 they become forked once more reminding us the branches of Arihrolham- 

 nus hifidus. Setchell,^' too, describes a plant with a branch torn off and 

 another branch forked again. He seems to have thought it an abnormal 

 form. The present writer is inclined to thin!< it a more old forn). 



In Japan, Eclc. hicydis attains 

 its maturity at the end of June and 

 the beginning of July. The hold- 

 fast becomes loose in this season and 

 enormou.-i qn;intity of the plant is 

 dashed upon tlic shores by the waves. 

 At the end of June the young plants 

 of single blade, vrith or without the 

 indication of pinna? at the margin of 

 the transition part, are to be found. 

 These develop into the forked form 

 before the next summer through the 

 ])rocess just as Setchell described in 

 the development of Eis. arhoria. If 

 some individual has gained a com- 

 paratively strong holdfast or has been 

 growing in calm water, it may remain 

 further without being uprooted by the 



A. A twice forked form of Esk. hicydis, Kjullni. 



B. The lateral view of the lower fork. 



Somewhat diagram atic. 



1.) Sylloge Algarum. Vol. III. p. 354, (1895). 



2.) Erythea. Vol. IV. p. 132. 



:^)- » „ „ p. 159. 



4). Phyceiie Japonicae novEe. p. 51. (1895). 



