GLOSSARY 447 



Fruit-body. A spore-bearing structure. 



Fusiform. Spindle-shaped. 



Germtube. A tube developed from a spore on germination. It usually 



gives rise directly to mycelium. 

 Gill. Plate or lamella of a mushroom, found on the lower side of the 



cap or pileus. 

 Haustorium (haustoria). Special mycelial branch sent into the cell 



serving as an organ for obtaining food. 

 Hetero2cious. Said of fungi (usually rusts) requiring more than one 



kind of host-plant on which to complete the life-history. 

 Hypertrophy. Abnormal enlargement of a part or the whole of a plant. 



Specifically, the abnormal enlargement of cells. 

 Hypha (hyphse). A vegetative or mycelial thread of a fungus. See 



mycelium. 



Infect. To cause disease. 



Infection. Act and condition of being infected. See infect. 

 Infection-court. Place where infection is initiated. 

 Inoculum. The transferable portion of a pathogene which may bring 



about infection. 



Lamella (lamellae). Gills of a mushroom. See gill. 

 Lenticel. A specially developed loose cellular structure in the cork 



of a plant through which an exchange of gases between the interior 



of the plant and the air may take place. 

 Lesion. Any definitely diseased region. 

 Middle-lamella. The primary membrane between any two cells of 



higher plants. 

 Morphology. The science which treats of the form, size and color of 



an organism. 

 Mycelium. The vegetative system of a fungus made up of hyphae 



or threads. See hypha. 

 Oospore. Special type of sexual spore. 

 Parasite. An organism which lives in or on another living organism 



during a portion or all of its life for the purpose of obtaining food 



and habitation. The latter organism is referred to as a host. 



A parasite is usually smaller than its host. 

 Pathogene. A disease-producing factor, usually an organism. 

 Pedicel. A fruit-bearing or flower-bearing stalk. 

 Peduncle. A general stalk bearing a group of flowers or fruits. May 



bear but one flower or fruit. 

 Perennial. Lasting more than two years. 



Perithecium (perithecia). Closed globose or flask-shaped, sexual fruit- 

 body containing asci. Finally a small opening or pore may appear 



at the top. See apothecium. 

 Petal. The inner row of flower leaves, usually white or colored other 



than green. 



