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CHARACTERISTICS OF FUNGI Specific yeasts are identified mainly by biochemical tests. Multicellular fungi are identified on  the basis of physical appearance, colony characteristics, and reproductive spores. 1. Vegetative structures—these are fungal colonies composed of the cells involved in catabolism  and growth.  a. Molds and Fleshy Fungi---the thallus (body) of a mold or fleshy fungus consists of long  filaments of cells joined together. The filaments are called hyphae. Individual hyphae can range  from microscopic to enormous. One fungus growing in Michigan is estimated to have hyphae  extending across 40 acres.  In most molds the hyphae are divided into uninucleate cell-like units by cross-walls called septae —these hyphae are called septate hyphae and usually have small openings in the septae that make 
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Unformatted text preview: the "cells" continuous. In a few classes of fungi, the hyphae do not contain septae and are called coenocytic hyphae. Hyphae grow by elongating at the tips. When a piece breaks off, it can grow to form a new hypha. The portion of a hypha that obtains nutrients is called the vegetative hypha; the portion concerned with reproduction projects above the surface of the medium and is called the reproductive or aerial hypha. Aerial hyphae often bear reproductive spores. When conditions are suitable, the hyphae grow to form a visible mass called a mycelium, which is visible without magnification....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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