I'.i 



Notes on pediastrum. W. L. Bray. 

 [Abstract. | 



Specimens of Pediastrum were kept under cover glass, in moist cham- 

 ber, for 12 days. In this preparation wag observed, in a number of cases, 

 the breaking up and swarming of the contents of a single cell toiorm new 

 colonies. From a sixteen celled specimen three cells " swarmed," each 

 giving rise to colonies of 32 cells. Inner lamella of mother cell escapes as 

 the enclosing membrane of swarming spores. This membrane increases 

 in size, as did also the spores, while swarming. Spores swarmed with 

 jerky movement about thirty minutes, gradually assuming the symmetri- 

 cal and permanent position characteristic of the colony, when motion 

 ceased. Protuberances (spines) began to appear on outer circle of cells of 

 new colony in 12 to 20 hours. In one or two cases the enclosing mem- 

 brane remained 24 houi^s. 



Individual cells of mother colony remained undivided for twelve days, 

 becoming several times the size of their fellows which had swarmed, very 

 turgid and rounded as if growing independently. From another collection 

 one case was observed where contents of a cell broke up into male swarm 

 spores. Not able to be sufficiently observed for more definite statements. 



Notes on the genus i.ytta. By W. P. Shannon. 



The genus corallorhiza. Bv aI. B. Thomas 



Notes on the flora op the Chilhowee and Great Smoky mountains. By 



Stanley Coulter. 



The seed of a large library of reference in cryptogamic botany in In- 

 diana ; WHAT THE COLLEGES ARE DOING TO SUPPLY THE DEFICIENCY. By 



L. M. Underwood. 



