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| Haematonectria | |
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| Haematonectria haematococca | |
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| Genus: | Haematonectria Samuels & Nirenberg 1999 |
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Haematonectria haematococca | |
Haematonectria is a genus of fungi in the family Nectriaceae.
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In addition to the normal karyotype, wild populations of many animal, plant, and fungi species contain B chromosomes. By definition, these chromosomes are not essential for the life of a species, and are lacking in some of the individuals. Thus a population would consist of individuals with 0, 1, 2, 3 (etc.) B chromosomes. B chromosomes are distinct from marker chromosomes or additional copies of normal chromosomes as they occur in trisomies.