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ADDITIONAL EXERCISES 



I. Key of Species Grown on Agar and Gelatin Media 



A. Species fruiting typically by coremia (vertical and definite). 

 a. Coremia long (3 to 15 mm.). 



1. Conidial masses strictly terminal, olive-green, fragrant. P. daviforme 

 (Fig. 249). 



2. Upper third of coremia fertile, conidia green. P. Duclauxii (Fig. 250). 

 aa. Coremia small. 



Fig. 252. — Penicillium roseum. a, b, c. Branching of conidial fructification, 

 showing few cells of each verticil; d, e, conidiiferous cell and conidiospores; g, h, j, k, 

 sketches of ripe fructification showing agglutination of conidiospores into slimy 

 masses. {After Thorn.) 



1. Coremia definite, densely crowded, colony orange below. P. granu- 

 latmn. 



2. Coremiform character indicated in cultures by clustering of conidio- 

 phores, definite coremia only in old cultures, becoming large and definite 

 upon apples. P. expansum (Fig. 243). 



AA. Species not (or rarely) producing coremia in culture. 

 B. Species constantly producing sclerotia, or ascigerous masses. 

 b. Producing ascigerous masses, yellow, or reddish. P. hUeum. 

 bb. Sclerotia appearing as white masses in old cultures. P. ilaliciim (Fig. 



l- 247). 

 bbb. Sclerotia reddish or pink, globose or elliptic, 500^ or less in diameter. 



