Fern fern ("Onoclea sensibilis"). Giant water fern ("Salvinia molesta") is one of the world's worst aquatic weeds. The important fossil fuel coal consists of the remains of primitive plants, including ferns. Ferns have been studied and found to be useful in the removal of heavy metals, especially arsenic, from the soil. Other ferns with some economic significance include: The study of ferns and other pteridophytes is called pteridology. A pteridologist is a specialist in the study of pteridophytes in a broader sense that includes the more distantly related lycophytes. Pteridomania is a term for the Victorian era craze of fern collecting
The Different Forms of Flowers on Plants of the Same Species The Different Forms of Flowers on Plants of the Same Species The Different Forms of Flowers on Plants of the Same Species is a book by Charles Darwin first published in 1877. It is the fifth of his six books devoted solely to the study of plants (excluding "The Variation of Animals and Plants under Domestication"). These writings contributed to Darwin's pursuit of evidence that would support his theory of natural selection. There were only two more books to follow: "The Power of Movement in Plants" (1880) and "The Formation of Vegetable Mould through the Action of Worms" (1881). He