134 



As R. transformans has never been reported on Amelanchier 

 certain infections of this host which I obtained in 1914 were 

 open to the question of accidental field contamination of teleuto- 

 spore material by spores from G. hiseptatum. Converse inocu- 

 lations from the roestelia obtained on Aronia back to small 

 potted plants of Chamaecyparis were made during the summer of 

 1914 and a considerable number of sori of "G. fratemum" ap- 

 peared on the leaves in February and March. Whether these 

 sori came from the artificial infections or from a perennial 

 mycelium in the cedars, can be determined only by further work. 



A large number of infections on both Aronia and Amelanchier 

 have been obtained with this material this spring. The results 

 agree with those of last }ear. The change of aecidial host has 

 been followed not only b}' a dift'erent reaction of the host plant 

 to the fungus as shown by the hypertrophies or galls, but also 

 by the transformation of the fungus itself to such an extent that 

 what has been regarded as a characteristically different aecidium 

 is developed. 



CoLtTMBiA University, 



Department of Botany 



REMEWS 



The Sc'naia Assemblage* 



A phycological paper of unusual systematic and biologic in- 

 terest is that on "'The Scinaia Assemblage" recenth^ published 

 by Professor Setchell. Scinaia, a genus of red algae of the small 

 family Chaetangiaceae, was first recognized and named nearly 

 a hundred years ago and for a long time was considered to have 

 but a single species, Scinaia furcellata, which was described 

 originalK' from England, but had since been held to occur in the 

 Mediterranean, on our Atlantic coast from southern Massa- 

 chusetts to Florida, and on the coasts of California, Chile, South 

 Africa, Xew Zealand, Hawaii, Japan, etc. Later, in part from 

 plants that had been passing as 5. furcellata and in part from 

 plants so ditlerent in habit as to have escaped confusion with 

 it, other species had been described until the genus was currently 



* Setchell, William Albert. The Scinaia Assemblage. Univ. California Publ. 

 Bot. 6: 79-152. pi. 10-16. 7 O 1914- 



