Lindra thalassiae n. sp., a scolecosporous pyrenomycete, has been isolated in considerable abundance from necrotic leaves of turtle grass, Thalassia testudinum König. This is the first isolation of a fungus from this widespread, ecologically important, marine flowering
plant. Spore germination tests indicate suitable adaptation of the fungus to a euryhaline environment. The significance of L. thalassiae in degradation of turtle grass is suggested by field and laboratory studies.
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