170 SUMMARY OF CURRENT RESEARCHES RELATING TO 



present genus is based on a single specimen from Columbus ; Phyto- 

 morula on a very few specimens from Berkeley, California ; and BurTcilUa 

 is known only from Burmah. Eutetramorus represents the lowest form 

 of the family, where a defined colonial organization is attained. 



E. S. G. 



Interesting Case of the Formation of certain Vacuoles at the 

 Ends of the Cells in the Desmid Closterium plurilocellatum. — A. A. 



Elenkin {Bull. Jard. Imp. Bot. Pierre le Grand, 1914, 14,'' 225-31 ; 

 see also Bot. CentralbL, 1915, 128, 598). An account of a phenomenon 

 observed by the author in 1909-10 in Closterium plurilocellatum. He 

 noticed at the end of every cell two or three vacuoles instead of the usual 

 one. They lay along the longitudinal axis, one after the other, diminish- 

 ing in size towards the thin end of the cell. In this way there was 

 formed a system of four to six terminal vacuoles in the Closterium cell, 

 a most unusual phenomenon, quite unknown in the genus. The two 

 largest globular vacuoles adjoin the chloroplasts at both ends ; they 

 are up to 5 /x in diameter, and contain always only one large grain of 

 gypsum each, of globular form, 1'2-2'5/x in diameter. The grains are 

 dissimilar in consistence ; each one has its distinct centre in the form 

 of a point resembling a pyreuoid. There lie also along the longitudinal 

 axis, at the cell-ends, one or two globular or slightly elongated vacuoles 

 of lesser size, containing one or several small gypsum grains. This 

 phenomenon was invariably found only in the cells of one species of 

 Closterium, which closely resembled C. peracero&um Gag. var. elegans 

 G. S. West ; but on account of the normal, constant, and very special 

 occurrence of this character, the author describes it as a new epecies. 

 The paper is written in Russian and German. E. S. G. 



Two Green Algae from the Genus Stigeoclonium Ktitz. — A. A. 

 Elenkin {Bidl. Jard. Imp. Bot. Pierre le Grand, 1914, 14, 235-50, 

 Russian and German ; see also Bot. CentralbL, 1915, 128, 599-600). 

 A detailed description of two species of Stigeoclonium which developed 

 in great quantity on calcareous tufa and on the walls of an aquarium in 

 the Institute for Spore Plants — S. longipilum Kiitz var. minus Hansg., 

 and S. variabilelSsieg. Both species were cultivated together and under 

 various conditions of water, light, and temperature, but neither exhibited 

 any variety of form. The former species, cultivated in hanging drops, 

 produced no zoospores ; the latter, on the contrary, produced many. 

 These zoospores must be regarded as macrospores, as each cell produced 

 only one, of almost globular form, 6 • 6-7 • 6 /x wide, 8-8 • 6 /a long, and 

 provided with four cilia. Microzoospores and gametes were not observed 

 The author regards these two species as entirely independent and of 

 different origin, having nothing to do with S. tenue Kiitz. He there- 

 fore proposes to call the former S. Eansgirgeanum, and for the latter, 

 >S. I'ana&i/e, he draws up a full and amended diagnosis. He rejects the 

 proposal of Hazen to revive the generic name Myxonema in the place 

 of Stigeoclonium. E. kS. G. 



Notes from the Woods Hole Laboratory. — F. S. Collins {Rhodora, 

 1918, 20, 141-5, 1 pi.). The first of these notes contains descriptions 



