8 Synopsis of the Bacteria and Yeast Fungi. 



into yellow. In the spectroscope it shows, among others, a character- 

 istic broad absorption band in the green. 



Palmella mirifica, Rabenhorst, can scarcely be anything different. 

 (See Journal of the Royal Microsco^cal Society, 1882, p. 655.) 



2. M. luteus, Cohn {J.c, p. 153). 



Bacteridium luteum, Schroter. 



Cells elliptic, somewhat larger than in M. prodigiosus, 

 with highly refractive cell-contents ; forming, on a solid sub- 

 stratum, clear yellow drops, which at first are as large as 

 a poppy-seed, and afterwards as a half-peppercorn ; at last 

 drying up to flat shield-shaped umbilicate discs. On nutrient 

 fluids this species forms a thick yellow skin, which becomes 

 plaited when luxuriantly developed. 



On boiled potatoes, etc. 



Colouring matter insoluble in water, unchanged by sulphuric acid 

 and alkalies. 



3. M. aurantiacus, Cohn {I.e., p. 154). 



Bacteridium aurantiacum, Schroter. 



Cells oval, about i "5 /* long ; on a solid substratum in 

 orange-coloured drops and spots, which at last coalesce 

 into equal-sized patches. On nutrient solutions it forms a 

 golden-yellow skin. 



On boiled potatoes and eggs. 



Colouring matter soluble in water. 



4. M. fulvus, Cohn {I.e., p. 181). 



Cells round, about i'5 /i in diameter; at first forming 

 .•A'."!? rusty conical tolerably firm drops of \ mm. 

 Slt'kti'fff/x in thickness, which increase and finally pro- 

 ''X^^:'kfli\f'% duce extended gelatinous masses. (Fig. 2.) 

 '•isHvS'' On horse-dung. 



Fig. 2. — Micro- 

 coccus fulvus 5. M. ohlorimis, Cohn {I.e., p. 155). 

 (after Cohn). ^^^^ ^^^^^ ^-^^ forming yellowish-green or 



