In 1951, Herb Wagner, while reviewing Irene Manton's " Problems of Cytology and Evolution in the Pteridophyta ", suggested in passing that " A . pinnatifidum " itself might represent a hybrid between " A . montanum " and " A . rhizophyllum ".
22.
The Equisetopsida were formerly regarded as a separate division of spore plants and also called "'Equisetophyta "', "'Arthrophyta "'or "'Sphenophyta "'; today they have been recognized as rather close relatives of the typical ferns ( Pteridopsida ) and form a specialized lineage of the Pteridophyta.
23.
It maintains notable collections of willows ( " Salix " ), " Ericaceae ", ferns ( " Pteridophyta " ) and mountain plants of New Zealand, as well as good collections of " Saxifragaceae " and plants from the Himalayas, East Asia, the Caucasus, North and South America, the Alps, and several European low mountain ranges.
24.
Mazon Creek flora includes : lycopsids, related to modern club moss, with arborescent forms named " Lepidophloios ", " Sigillaria " and " Lepidodendron ", and herbaceous forms called " Lycopodites " and " Cormophyton "; sphenopsids like " Calamites " a tree-like horsetail relative, with common foliage names of " Annularia " and " Asterophyllites ", and a vine-like form called " Sphenophyllum "; Pteridophyta as marattitalean tree ferns and Filicales and Zygopteridales understory ferns, with common foliage names of " Pecopteris ", " Acitheca " and " Lobatopteris "; pteridosperms, also known as seed ferns, an extinct group of plants that grew both as trees and smaller shrubs, with features like pinnated leaves similar to true ferns, but reproduced by seeds instead of spores; they had common foliage names " Mariopteris ", " Alethopteris ", " Odontopteris ", " Neuropteris ", " Laveineopteris " and " Macroneuropteris "; extinct gymnosperm " Cordaites ", believed to be closely related to and sharing many features with modern conifers.
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