THE EXAMINATION OF PLATE CULTURES 



Edges of colonies. 



Entire : without toothing or division. 



Undulate: wavy. 



Repand ' : like the border of an open umbrella. 



Erose : as if gnawed, irregularly toothed. 



Lob ate. 



Lobulate : minutely lobate. 



Auriculate : with earlike lobes. 



Lacerate : irregularly cleft, as if torn. 



Fimbriate : fringed. 



Ciliate : hairlike extensions, radiately placed. 



Tufted. 



Filamentous : as already defined. 



Curled: as already defined. 



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67 9 



FIG. 5. Structure of colonies : i, conglomerate colony ; 2, toruloid 

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

 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. 



