82 



Hymenium, a surface of greater or less extent, and variously 



situated, bearing basids which produce spores. 

 Hypha, a thread, usually one bearing spores. 

 Mycelium, the thread-like, vegetating part of fungi, making a 



loose felt of very long colorless threads. 



Peridium, a wrapper or envelope protecting clustered spores. 

 Perithecium, a small envelope or involucrum containing spores. 

 Stroma, a close body formed by the association of threads. 

 Sclerotium, a hard, stem-like body produced by the induration of 



united threads of mycelium. 



182. Growing in the air, or in other plants or in animals. 183 

 Growing in water or watery liquids. 



Growing on decaying vegetables or animals. Mostly one celled, 

 but much branched. Producing vegetating swarmspores in spe- 

 cial cells at the ends of branches. Reproducing by means of 

 fertilized oospores. SAPROLEQNIEI. 



Sexual reproduction unknown. One-celled ferments. 



Schizomycetes. 



Multiplying by cell division. Very minute, microscopic organisms, 

 often in a state of lively motion. Producing or accompanying 

 disease and putrefaction. BACTERIACE.S:. 



Multiplying by budding, or by the formation of brood cells. Pro- 

 ducing fermentation. SACCIIAROMYCETES. 



183. Multiplying by means of vegetating, ciliated swarmspores. Pro- 

 bably reproducing also by means of zygospores. One-celled or 

 two-celled plants, parasitic in algae, or in the epidermis cells of 

 phanerogamous plants. CIIYTRIDIACEJE. 



Forming zygospores by the conjugation of special cells. Producing 

 also vegetative spores in heads, not ciliated. Molds. MUCORINI. 



Not multiplying by means of ciliated swarmspores, nor reproducing 

 by zygospores. 



Spores vegetating to minute, naked, self-moving, gelatinous bodies, 

 which unite to a creeping, slimy mass, or plasmodium, that at 

 length produces spore cases. MYXOMYCETES. 



Spores vegetating to a cellular mycelium. 



