Glossary 385 



PERITHECIUM. A flask-shaped or globose sexual fruiting 

 . body containing asci. 



peritrichiate. Flagella all over the surface. 



pionnotes. An effuse conidial stage containing a maxi- 

 mum of conidia and a minimum of aerial mycelium. 



Plasmodium. A mass of naked protoplasm with numer- 

 ous nuclei and capable of amoeboid motion. 



polar flagella. Flagella borne at the polar ends of an 

 organism. 



protoplasm. The living substance of any plant cell. 



pseudopionnotes. False pionnotes. 



pseudostroma. False stroma. 



pustule. A blister or pimple. 



pycnidia. Sac-shaped fruiting bodies of a fungus in 

 which the pycnospores or summer spores are formed. 



pycnospores. Summer spores of certain fungi which 

 are formed in pycnidia. 



sclerotia. Compact masses of mycelium in a dormant 

 state. These help to carry the fungus over un- 

 favorable weather conditions. 



septum. Any partition between two cells in the same 

 fungus filament. 



sbtje. Bristle-shaped bodies. 



soil flora. Bacterial or fungus growth in a soil. 



sorus. Heap of spores. 



sporangiophore. Stalk-bearing sporangium. 



sporangiospores. Spores formed in a sporangium. 



sporangium. Free non-sexual bearing spore sac. 



spores. Seed of bacteria or fungi. 



stomata. Minute openings in the stems, leaves, or fruits 

 of plants which serve as a medium of exchange of 

 gases. 

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