78 ATLAS OF BIOLOGY. 



Penicillium glaucum. 

 FIG. XVI. A small portion of the crust of Penicillium in transverse section. A. 2. 



FIG. XVII. A piece of the above, teased up. 



i., ii. Two adjacent conidia. For further varieties see Brefeld (129). D. 4. 



iii. One series of stylo-gonidia of the same, more highly magnified. F. 3. 



FIG. XVIII. Successive stages. observed during one day's (10 hours) growth of a coni- 

 diophore of Penicillium. 



Object glass culture. D. 4. 



FIG. XIX. A group of germinating Penicillium spores. 

 Object glass culture. D. 2. 



FIG. XX. The same, sixty hours after sowing. A. 2. 



FIG. XXI. Isolated spores of this fungus. 

 Many are germinating. D. 4. 



FIG. XXII. Successive phases in the germination of a single spore. D. 4. 

 FIG. XXIII. Phases in the conjugative reproduction of Penicillium. 



FIG. XXIV. Germination of one of the ascospores, produced as the result of con- 

 jugation.* 



[Figs. XXIII. and XXIV. after Brefeld (129).] 



Aspergillus, 



FIG. XXV. Spore-bearing hypha of this fungus, from a slice of bread exposed to a 

 warm moist atmosphere for 15 days. D. 3. 



FIG. XXVI. The conjugative phase of the same. 



Obtained by teasing up the yellow portions of the fungus, grown as above. The hypbas 

 marked * are two last developed ones of a great number (not drawn) which formed the 

 investing peritheca, the limits of which are indicated by a dotted line. D. 4. 



FIG. XXVII. Portion of a spore-bearing carpogonial hypha of the above, at a later 

 stage. F. 3. 



[Figs. XXV. to XXVII. from life, after de Bary and Woronin (126).] 



* The chances of the student's obtaining a cultivation of the conjugative phase of this fungus being but slight, the 

 Eurotium stage of aspergillus is supplemented, as it can be readily obtained. 



