from The Century Dictionary and Cyclopedia
- n. In cryptogamic botany, a tubular or thread- like growth first formed by a spore in germination, which by continued development and cell-division in one or more directions becomes the thallus. In fungi the germ-tube may develop into either the ordinary mycelium or a promycelium.
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No. 4 represents a longitudinal section of Potato-stalk with germinating zoospore, the germ-tube of which has pierced the cell-wall, and is growing inside the cell, as shown at +.
The spores on germination form a short germ-tube, in the terminal cell of which the apical cell is established, but the direction of growth of the young thallus is usually not in the same straight line as the germ-tube.
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