一 189 ― 



Fernle ones have a definite growth, while sterile hairs grow indefinitely, 

 elongating by the division of basal cells. The hairs in which gametangia 

 are formed remain short ； some cells near the free extremity divide by 

 transverse partitions into smaller cells and put the beginning of game- 

 tangia, while the lower ones remain unchanged. The fertile cells then 

 divide longitudinally and double rows of cells are thus formed. By re- 

 petition of longitudinal and transverse divisions, ^ametan^ia are fully 

 formed, which are ovato-cylindrical or oblong. i hey are furnished with 

 a pedicel composed of a single longitudinal row ot cylindrical cells. The 

 number of cells composing the pedicel varies from 2 to 6 or perhaps 

 more. The length of sterile hairs varies from 203 to 384 ！上 with the 

 breadth of 8.5-13 ,"， while that of gametangia 38-53 fi by 13-15 / ノ， and the 

 total length of the fertile hairs (i.e. gametangia and pedicel taken together) 

 -amounts to 43-114 ド. By this way, gametangia are accompanied by a 

 few sterlie hairs and both occupy irregularly roundish patches or sori 

 having no definite boundary. Paranemata and sporangia unknown a 

 present. 、 



Colour and substance : 1 ne plant is chestnut-brown in colour when 

 fresh. After removal from the sea it soon chan^^es into pale greenish- 

 yellow in exposure to air， or dirty greenish-blue when heaped together, 

 owing to the decomposition. After drying, the colour chahges into dull 

 greenish-yellow. The plant gives slightly astringent and sour taste. The 

 substance is coriaceo-membranous and rather brittle when fresh, but soon 

 changes into tenacious consistency. In drying, plant becom#*s very thin 

 and papyraceous and does not adhere to paper. 



Remarks : Having been struck by the larger size of frond and nature 

 of gamentangia, I took the present plant provisionally for a new genus 

 naming it Tabacopsis ucetosa in my Nippon So.ui-Meii (" Enu- 



