42 



PLANT LII-E. 



face of the object upon whicli the fungus lives; or parts of 

 it may be superficial, and part may penetrate that object ; or 

 all of it may be hidden within the substratum.* In some of 

 the common molds (Mucorini), the cobwebby threads lying 

 upon the surflice of the substratum constitute the exposed 

 part of the mycelium, while other hyphas p^enetrate deeper ; 



Fig. 50. — A suctinn nf part nf the aerial Ijody of Fi.'/yf'o'us. j/, tiyplise running at an 

 angle to the seetinn, cut across ; A', crystals r)f o.xalate of lime. Magnified about 

 500 diam.— After Vogl. 



in others (Penicilliiim, etc.), the su|ierficial hypha: become 

 so interwoven that they may be lifted olf the substratum (as 

 from jellies, jams, svrui)s, etc.) as a coherent layer. But in 

 most cases, especially when the fungus grows on a solid 

 medium, the ]iyph;e l)ecomc atlhereiit to it and permeate it 

 so that they cannot be se]iarated from it, e\en by the most 

 careful dissection. 



"^ 1 lii.s nda-coiiiniittal iL-nii may be u.sed to dcsionatc tlie material upon 

 wliich the vet^etalive part of ttie fiin^nis grows, whether it lie a living 

 body, a tleatl <)rgani.sm, or organic matter in boliil or h([uid torm. 



