— 27 — 



some length and the youngst I could find was 6-celIs-lonq- plan let which 

 stands with a slender root. Of those 6 cells, all except the apical one 

 and the next have cortical cells already cut off. In surface view, the 

 cell just beneath the terminal is not yet divided ； but the next has a 

 rino" of cortical cells and each of the 3 lar ゾ er followincr has 2 zones of 

 cortical cells produced. The primary root-fibre is a simple or jointed 

 tube and expands into a scutate disc. In a little advanced stan'e, 

 another hair-like root makes its appearence. As the plantlet grows » 

 the arrangement of cortical cells becomes somewhat Irrep-ular in older 

 part and newly formed root-fibres run clecurrent within the wall of 

 the orip^Inal root. By this way, oriijinal slender root becomes much 

 thicker in ai^e. On the apex, now, minute hair-leaves make their ap- 

 pearence. 



Colour of frond is da rk purplish-brown and the substance is soft 

 and tenacious, plant firmly adhering to paper in dryinp-. 



Hab. ： On rocks between tide-marks. Sakasecrawa in Amakusa 



o 



Islands in the Prov. nigo. 



The present genus which was established by Aanardini from the 

 materials collected at Borneo was considered by him as one havin?" 

 an affinity with Chrysyincnia and was placed under the family 

 Cryptoncniiaceae. Other subsequent writers considered it to belong* to 

 the family Rhodomdaceae、 but the knowledo-e about its systematic 

 position long remained wanting*. I was fortunate enou!7h to study the 

 plant in question with regard to its structure and development, so as 

 to settle the doubt as to its systematic position. Mr. Oishi, the 

 post-graduate student of the Imperial fisheries Institute was kind 

 enough to put the tolerable amount of the alcohol specimens under my 

 disposal, which he collected at Sakasegawa in the Amakusa Islands, 

 in August, 1902. 



