200 BOTANICAL MAGAZINE. [7oi. xvii. 



ECABALLOCYSTIS CAVA, sp. nov. 

 (PL VIII. fig. 20-26.) 



Thallo membranaceo initio solido tuberculato affixo postea hemispliBerico 

 sinuato demum bullato cavo basi margine supra substratum adheerente dia- 

 metro 6-19 mm., Isete-virescente, e celluHs in gelatinosa substantia inclusis 

 ad periph^riam dense aggregatis stipitibus mucosis obscuris, constante ; 

 cellulis peripb^ricis subsphaericis vel lunatis seepissime binis vel quattour 

 proxime confertis, interioribus infimisque subglobosis nonnunquam dissolutis 

 longe fibrillosis ; cbromatophoribus cucullatoformibus dimidiam cellulae par- 

 tem occupantibus, pyrenoidibus conspicuis singulis in membrane amyli intectis, 

 zoosporangiis e cellularum contentu evolutis, zoosporis intra singulas cellulas 

 paucioribus (4-12). 



Dimentiones cellularum: 10 x 5/z— 10 x 8/-z — 10 x 7/z— 10 x 5/^— 

 10xl0/>«. 



Habit : in rnari Parifico ad eras '' Misaki " Japoni{:e. 



The genus EcboUocy^tis has been established by Bohlin^^ from a 

 specimen collected in Eio Grande do Sul. Nothing has since been assigned 

 to the genus. 



In the summer of 1901, the present writer has collected a dark green 

 alga on a rock at high tide mark in front of the Minnesota Seaside Sta- 

 tion at Port Kenfrew, Vancouver Isl, B.C. On examining the specimen 

 after it has been broaght to Japan I could not satisfactorily refer it to any 

 of the known plant hitherto reported from the American coast. Some of 

 the preserved specimen were sent to Prof. N. V^^ille for determination. In 

 the succeeding years I found two another species of green algae on the 

 Pacific coast of middle Japan which had close resemblance with the Canad- 

 ian alga. Meanwhile Prof. Wille wrote me that the plant I have sent 

 him seems to be an undescribed species under the genus Echallocystis, 

 Boh], which was known exclusively from the fresh water ; and he urged 

 on me to described it myself. 



Examining further I found the three species satisfactorily referrable to 

 Ecahallocystis, Bohl. The characteristic mode of the cell division, leaving 

 the gelatinous stalks behind is clearly manifested in our plants. The Van- 

 couver alga has its cells half as large as the type plant and the Japanese 

 algae are nearer to the former in this respect. I feel it much pleasure to 



1) Die Algen der ersten Kegnellschen Expedition. I. Protococcoideen. p. 7. 



