Brackens (Pteridium) are a genus comprising several species of large, coarse ferns. Ferns (Pteridophyta) are vascular plants that have alternating generations, large plants that produce spores and small plants that produce sex cells (eggs and sperm). Brackens are in the family Dennstaedtiaceae, which are noted for their large, highly divided leaves. They are commonly found on moorland. Brackens are cosmopolitan, being found on all continents except Antarctica and in all environments except...
Brackens (Pteridium) are a genus comprising several species of large, coarse ferns. Ferns (Pteridophyta) are vascular plants that have alternating generations, large plants that produce spores and small plants that produce sex cells (eggs and sperm). Brackens are in the family Dennstaedtiaceae, which are noted for their large, highly divided leaves. They are commonly found on moorland. Brackens are cosmopolitan, being found on all continents except Antarctica and in all environments except deserts. The genus probably has the widest distribution of any fern genus in the world. In the past, the genus was commonly treated as having only one species, Pteridium aquilinum, but the recent trend is to subdivide it into about ten species. As ferns, brackens do not have seeds or fruits, but the immature fronds, known as fiddleheads, are edible. The word bracken is of Old Norse origin, related to the Swedish word braken, meaning fern.
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Издание посвящено одной из важнейших проблем клинической кардиологии — сердечной недостаточности. В работе обобщены фундаментальные и новейшие данные литературы, касающиеся различных аспектов физиологии и клинической патофизиологии сердца, а также представлены взгляды авторов на обозначенную проблему, сформированные на основании результатов собственных исследований. Особое внимание...
Издательство:
Медицинское информационное агентство
Дата выхода: февраль 2018
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