MORPHOLOGY OF BLASrA PUSILLA 
433 
In testing the plants in concentrated sulphuric acid, the thal- 
lus was found to melt away quite readily in from one to three 
hours, leaving the strands seemingly unaffected by the acid. At 
IT. 
Fig - . 85. — 3, “Longitudinal section through conducting strand. 4, Enlarged 
strand showing external markings. 
28 
