190:^.] THREE NEW MARINE ALGM FROM JAPAN. 103 



The plant is hitherto known from tlie sonth coast of the province of 

 Shima and the east coast of the province of Kii, on the rocks at the 

 depth of 1-5 fathoms bylow low water marks. It is collected in large 

 quantity there and sold in market. 



CHAmPIA EXPANSA, sp. nov. 



PI. III. fi^. 10-13. 



Fronde erectiuscuhi mox compresso-complanata regnlariter dichotome 



ramosa flabellata, ambitn reniformi ; laciniis concentrice zonatis, linearibus 



vel truncatis sinubus laxis, apicibus l)iiidis, prolificationibus e margines 



laciniarum adultiornm ; cystocarpiis subspha^ricis ad lacioias sessilibus, 



tetrasporangiis 



The plant differs widely in its external form from the members 

 hitherto mentioned under the present genus. Bat the structure of the 

 frond and the cystocarp prove Champia. The bifurcation of the apices 

 suggests some relation to Ch, bifida, Okam., from which, however, may 

 easily be distinguished by having regularly dichotomous branching and the 

 broad much compressed segments. 



Hab. Misaki ; On rocks about 8 fathom deep below the tide marks. 

 (Dr. K. Imamura ; April, 1901) ! 



Botanical Institute, Imp. Univ. Tok^^o. 

 16. April, 1903. 



EXPLANATION OF THE PLATES. 



PI. II. 

 Hirome undarioides. 



Fig, 1. A typical plant. The sori covering the rachis at the lower 

 portion are seen bifurcated at the terminal part at the point 

 about one third of the length of the lamina. 



Fig. 2. A portion of rachis showing the sori running along the both 

 sides. 



PI. III. 



Fig. 1-3. Caulerpa tateyamensis. 



Fig. 1, Plant in natural size. 

 Fig. 2. Pairs of ramules with typical stipes. 



Fig. 3. A r.imule from the upper portion of the frond, the stipe is not 

 sharply distinguished. 



