coHn’s ‘é BEITRAGE ZUR BIOLOGIE DER PFLANZEN.” 916 
before a of the ceil-contents. In Stephanosphera and Chlan y /o- 
coccus the nucleus with its nucleolus is developed only in the resting 
? 
found only in the white spaces. It would thus appear that the 
Chroolepus finds a suitable nidus a: in those ere” of cork which 
That the occurrence of gonidia in sociation with vv one is essen- 
tially dependent on an ordinary law ion is shown by 
studying Arthronia epipasta, which is ctl deprived of as nidia, and 
on the bark of the host of. which (but never in connection with the 
Th 
Eten of : a (probably) Pyrenomycetous fun: h lies over the 
Li seaaiee with these ater occur single or grouped Pleuro- 
oo cells, taken by Tulasne to be the ia of Arthropyr enia, with 
brpop thro pu te covering periderm and differentiates ‘te the three 
* With this may be compared Solms observation on the tissues 
investing growing examples of Brugmansia Zippel, Sit tee, 178 a5 
es: 
* 
