Griffiths: Anthurus borealis Burt 



631 



necessarily the result of artificial development in a moist chamber, 

 for several very small plants, about 8 cm. in length, were found 

 developed under natural conditions. These, however, as a rule, 

 grew beyond the mulching in the edge of the grass. The number 

 of branches of the receptacle is quite variable. Professor Burt de- 



r 



scribed the plant with five fully developed branches and one abor- 

 tive one. While this is apparently the normal condition in our 

 specimens, a large number were found with seven arms and a few 

 with eight. But whether with six, seven or eight, the abortive or 

 smaller branch is nearly always present. 



The accompanying cut was made from a photograph by Dr. C. 

 C. Curtis, taken from plants which elongated in a moist chamber. 

 The plant in the center of the figure and the one next to it on the 

 right are fully extended. The outside objects are medium sized 



eggs. 



The figures arc reduced to a little less than one half natural 



size. 



Columbia University, Nov. 15, 1899. 



