On a New Penetrating Alga. 99 
a row of cells, some of which have begun to put out penetrating 
branches. 
beginning to put out penetrating branches ; D, shews method of branching and 
shape of cells ; E, resting spore crowded with starch grains ; F, resting spore 
germinating. A, B, C and D, x 540. E and F, X 860. 
The surface cells are from 8 to 10 /a broad and 10 to 1 6 /x long 
except when they are irregular in shape. The penetrating cells 
may reach a length of I 10/a and are only 2/a wide. 
