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- W2974275417 abstract "Fungi are mostly terrestrial. Less than 2% of the species are aquatic. These include primitive species with zoospores (Chytridiomycetes and Oomycetes) and re-migrant types mostly in Ascomycetes and Fungi Imperfecti (including Hyphomycetes) with a very few in Basidio-mycetes. Aquatic Hyphomycetes are abundant on decaying leaves (especially of broad-leaved trees) in well-aerated streams and rivers. Their conidia are hyaline and mostly of unusual form. In many the conidium is tetraradiate consisting of four long arms diverging from a common point. In the different genera the tetraradiate conidium develops in very different ways. In some it is a phialoconidium; in others a thalloconidium. In some attachment to the conidiophore is by the tip of one of the four arms; in others near their point of divergence. In some all arms develop simultaneously; in others in succession. The wide range of developmental geometry suggests convergent evolution. The tetraradiate aquatic spore also occurs in Basidiomycetes. The only two higher Basidiomycetes (both marine) with submerged sporophores have tetraradiate basidiospores. The world-wide distribution of aquatic Hyphomycetes is discussed. Their general ecology is also considered. Concentrations of 1000 to 10,000 conidia per litre may be reached in small rivers in autumn. Attention is paid to the possible biological value of the tetraradiate aquatic spore. The evidence suggests that this is connected with the problem of initial anchorage in the turbulent conditions of a stream." @default.
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- W2974275417 date "1975-01-01" @default.
- W2974275417 modified "2023-09-23" @default.
- W2974275417 title "Convergent evolution in aquatic fungi: the tetraradiate spore" @default.
- W2974275417 hasPublicationYear "1975" @default.
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