514 HowWE: PHYCOLOGICAL STUDIES 
4. Cortical cells in surface view; from a glycerin mount, in which the boun 
daries of the cell walls are too indistinct to be drawn with accuracy. 
imilar view in an older part of the thallus, with the cell walls more swollen 
and the protoplasts more widely separated. 
6. Cortical cells in surface view, after staining with haematoxylin and treat- 
ment with KOH. The grouping of the cells indicates more or less clearly their 
relations to the subcortical cells; e. g., the upper group of six cells crowns a single 
subcortical cell. 
7 stellate or radiate termination of one of the medullary filaments. 
8, Capitate and stellately branched terminations of the medullary filaments 
in more ficken The pedicel in each figure shows the beginning of a lateral branch. 
about halfway between the cortex and the capitate terminations of the medullary 
aments. 
12. rtion of a medullary filament terminating in the subcortex and showing 
the beginnings of two lateral branches. The terminal cell of such branches carries 
a dense and conspicuous protopla 
13. Stellately branched sitencticat cells from a young part of the thallus, one 
f them showing 13 branches. ese branches connect with other similar, but 
mostly smaller and more peripheral cells, from which they have been detached. 
FicurEs 1-6, 8, 9, 11, and 12 are enlarged 276 diameters; 7 and 10, 46 diameters; 
13,244 diameters. The sections and fragments from which figures 2, 3, 6, 7-10, 12, 
and 13 were drawn were stained with haematoxylin and then swollen out with a 
solution of KOH; in figures 2, 3, 8, and 9, the thickness of the gelatinous cell walls 
and probably the dimensions of the parts in general have been somewhat exag- 
gerated by an excess of KOH. FmGuRE 11 was drawn from material that had been 
stained with picric-nigrosin, 
