Marine Mycology: The Higher Fungi by Jan Kohlmeyer

By Jan Kohlmeyer

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Deepsea pressures, combined with low temperatures and low nutrient concentrations, may even have preservative effects on certain microorganisms (ZoBell, 1968). Tests for the tolerance of high pressures and low temperatures can indicate whether the isolated fungal species are indigenous deep-sea forms or aliens from other habitats. No such experiments with fungi have been conducted thus far. The other method to obtain indigenous deep-sea fungi is to search for them directly on substrates that had been submerged in the deep sea at known depths (Kohlmeyer, 1968b, 1969a, 1977).

Marina in culture, predicts that this psychrophilic fungus would not occur in areas where the water temperature reaches 30°C, even for a short time, because the species has an optimum temperature of 15°C and all development ceases at about 25°C. In fact, D. marina has not been recorded from tropical or subtropical regions, and Brooks (1975) collected the species in Rhode Island only during winter and spring, when water temperatures there are 15°C or below. G. C. Hughes (1974) plotted the distributions of 20 marine woodinhabiting fungi on zonal maps based on his proposed classification.

The needle-shaped ascospores are forcibly discharged and, thus, may be inserted into vital elements of the host. , 1976). 26 F i g . 5. 3. A s c o s p o r e s , B a s i d i o s p o r e s , a n d C o n i d i a Turgidosculum ulvae, 4-/xm l o n g i t u d i n a l section t h r o u g h a s c o c a r p apex; ostiolar canal filled with a turgescent pulvilius (arrow) of gelatinous material that dries u p o n e x p o s u r e at l o w tides a n d p e r m i t s dispersal of a s c o s p o r e s (Herb. Setzer 3750; N o m a r s k i i n t e r f e r e n c e c o n t r a s t ; b a r = 2 0 /urn).

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