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Spore Release Questions

Question 1

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Answer 1

Active discharge from the basidiocarp hymenium involves formation of a drop which on drying causes the sudden movement of the centre of gravity in the spore. Ascospores are released actively following buildup of hydrostatic pressure in the ascus. Though both involve control of fluid, it is hard to see how these quite different mechanisms can be related.


Question 2

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Answer 2

Ballistospores will only be released in humid conditions. The drop of water discharged from the tip of the sterigma will dry in conditions of low humidity, preventing spore discharge.


Question 3

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Answer 3

In the case of active release, spores are shot into the air where the air current then carries the spore away (if it is light enough). Thus the mechanism of release enable the movement of spores above the still air boundary layer. Dry spores are also wind dispersed, wind dries the conidia and they are carried individually in wind. It is unclear how some of these are carried above the boundary layer, in the first instance. Basidiospores in puff balls, however, become airborne due to a drop of rain hitting the side of the leathery basidiocarp. Rapid changes in the internal air pressure force air carrying spores through the small ostiole. Spores in mucilaginous drops appear to be carried by vectors such as insects. The mucilage sticks to the surface of the vector which then caries the spores away.


Question 4

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Answer 4



Question 5

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Answer 5



Question 6

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Answer 6



Question 7

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Answer 7