353 
On my visit to Heligoland in the summer of 1901 I mentioned 
my find to Dr. Kuckuck and he told me that he had found tetra- 
spores both on Ch. virgatula and on Ch. secundata which is very 
Fig. 54. Chantransia virgatula Harv.) Thur. a, b, c, Portions of plant with tetraspores; d, transverse section 
of basal disc, a 80 : 1; b and c 100 : 1; d 250 : 1. 
closely related to the former, and he has since sent me his slides 
for examination and the specimens in them except for some minor 
differences, seem to correspond exactly with my Fseroese material. 
In fig. 53 I have shown portions of the plant in question. Both 
kinds of spores often occurred on the same plant, frequently even 
