THE EXAMINATION OF PLATE CULTURES 37 



Edges of colonies. 



Entire : without toothing or division. 



Undulate : wavy. 



Repand : like the border of an open umbrella. 



Erase : as if gnawed, irregularly toothed. 



Eoiate. 



Lobulate : minutely lobate. 



Auriculate : with earlike lobes. 



Lacerate : irregularly cleft, as if torn. 



Fimbriate . fringed. 



Ciliaie : hairlike extensions, radiately placed. 



Tufted. 



Filamentous : as already defined. 



Curled.- as already defined. 



6 7-9 



Fig. 5. Structure of colonies : 1, conglomerate colony ; ;;, toruloid 

 colony; 3, alveolate structure; 4, grumose in center; 5, moiu- 

 loid ; 6, clouded ; 7, reticulate ; 8, marmorated ; 9, gyrose. 



6. Optical characters (after Shuttleworth). 



Transparent : transmitting light. 



Vitreous : transparent and colorless. 



Oleaginous : transparent and yellow ; olive to linseed oil 



colored. 

 Resinous : transparent and brown, varnish or resin colored. 

 Translucent : faintly transparent. 

 Porcelaneous : translucent and white. 

 Opalescent : translucent, grayish white by reflected light, 



smoky brown by transmitted light. 



