298 SUPPLEMENT. 



Insert at page 187 



Chroolepus unibiinum. Kutz. 



Stratum thin, crnstaceous, rather pulverulent, reddish brown 

 growing pale when dead, threads and branches abbreviated, 

 torulose, joints nearly as long as broad, broadly elliptic or sub- 

 globose. 



SIZE. Ce.ls -02 mm. diam. 



Rabh. Alg. Eur. i., 372. 



Protococcus crustaceus, Kutz. Spec. 203. 



Protococcus umbrimts, Kutz. Pbyc. Gen., t. 7, f. 2. CoLn in 

 Hedwigia i., p. 1. 



On the bark of beech and oak. (Kelvedon. E. G. V.) 

 Plate CXXX. fig. 2. Chroolepus umbrinum X 400 diam. 



