ABNORMAL CONJUGATION IN SPIROGYRA 
J. G. BRown 
(WITH THREE FIGURES) 
Recently while teaching a class in plant histology, the attention 
of the writer was directed by one of his students to the conjugating 
cells of Spirogyra shown in the accompanying figures. The material 
from which the figures were drawn, which answered to WOLLE’s 
description of S. nitida,: was collected in the Rillito River north of 
Tucson in April 1917. When they were examined under low 
power lens, the conjugating cells shown in fig. 1 presented the 
appearance of a knot. Upon analyzing the situation, one of the 
four cells was found to have connections with three others, two with 
*WoLLeE, Francis, Fresh-water algae of the United States, p. 217. 
269] [Botanical Gazette, vol. 66 
