THE GENUS CITROMYCES. 



347 



green in the mass, and arranged in long chains. Ascospores are 

 unknown. 



Citromyces Pfefferianus, Wehmer, is undistinguishable from 

 " Penicillium glaucum" even in colour, by the unassisted eye. 

 It occurs as a tough, pure green mould, turning to greyish green, 

 grey or brownish with age, on sour fruit, sugar solutions, sugar 



FIG. 183. Citromyces Pfefferianus. 



Conidiophores, at b and d after removal of the conidia, showing- the variable globule 

 with simple steriginata ; e is a malformation, a sterigma growing- out into a new 

 couidiophore. Conidiophoi-es, slightly magnified at/. Hyphje at g, from a growth 

 in a calcareous nutrient solution, showing spherical, granular, or compact 

 enveloping deposits of calcium citrate. Ripe and germinating conidia at h. 

 Magn. of a-e, 400 ; of/, 240 ; of #, 400, of h, 600. (After Wehmer.) 



preserves, and lemon-juice ; and in the open air as a fine green 

 coating, occasionally on old mushrooms, &c. (e.g., Pholiota squar- 

 rosa). The delicate, colourless conidiophores, measuring 3/4 in 

 diameter (see Fig. 183) are scarcely 70^ high, forming a dense 

 herbage and carrying a globule, 4-8 n across. On this the 

 sterigmata, 9-14^ long and about 3yu thick, are arranged in a 

 whorl or are irregularly distributed over the surface, a consider- 

 able part of which is usually left exposed. All the parts are 



