GLOSSARY 



A 



AcERVULUs (Acervuli). A non-sexual, open cup-shaped 



fruiting body of fungi. 

 iEciDiosPORES. Spores of rust fungi borne in an iEcidium, 

 iEciDiUM (iEcium). A cup-shaped body in which are 



formed the spring spores of certain rust fungi. 

 Aerobe. Micro-organisms requiring air, more especially 



oxygen. 



Ammonification. The formation of ammonia at the ex- 

 pense of other forms of nitrogen compounds, accom- 

 plished through the action of soil micro-organisms upon 

 organic substances. 



Ammonifiers. Soil micro-organisms which are capable of 

 transforming nitrogen compounds into ammonia. 



Amceboid. Like an amoeba, the creeping movement of 

 which is made possible by appendage-like bodies. 



Antheridium. The male sexual organ of fungi. 



Apical. Terminal formation at the point of any fungous 

 structure. 



AscospoRE. Spore borne in an ascus. 



Ascus (Asci). Winter sexual spore sac, within which are 



formed the ascospores. 

 Arthrospores. Whole vegetative cells of either bacteria 



or fungi which, by a thickening of their wails, become 



resting spores. 



B 



Bacterium (bacteria). Simplest form of plant belonging 

 to a low order, lacking chlorophyll, and reproducing by 

 means of fission. 



411 



