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1
Paleobotany and the Evolution of Plants
That this represents the way in which the pter- idosperm synangium evolved is
evidenced by Carboniferous genera of presumed pteridosperm microspo-
rangiate structures (Meyer-Berthaud, 1989). For example, in Zimmermannitheca (
Remy ...
Wilson Nichols Stewart, 1993
2
Taxonomy of Angiosperms
The Pteridosperm Theory Throughout the Palaeozoic from the Upper Devonian
to the Permian, leaves closely resembling those of living ferns are abundant.
Some of these leaves were associated with cycad-like.stem structure and on the
...
3
Plant Life Through the Ages: A Geological and Botanical ...
In the possession of two kinds of spore a pteridosperm agrees with Selaginella
and Isoetes among the lycopods and with the water ferns (Hydropteri- deae)
Pilularia and Azolla; but the larger spores of a pteridosperm were not shed from
the ...
4
Paleopalynology: Second Edition
Falcisporites Falcisporites (as well as Vitreisporites and Exiguisporites) pollen
was reported from pollen sacs of Caytonanthus (Jurassic caytonialean) and
Harrisiothecium (Triassic pteridosperm) by Townrow (1962). Townrow (1965)
also ...
5
Developmental Genetics and Plant Evolution
Chapter. 6. The. Mostly. Male. theory. of. flower. origins: summary. and. update.
regarding. the. Jurassic. pteridosperm. Pteroma. MichaeI W. Frohlich ABSTRACT
The Mostly Male theory is the first explanation of the evolutionary origins of the ...
Quentin C.B. Cronk, Richard M. Bateman, Julie A. Hawkins, 2002
6
The Seeds of Dicotyledons
Misconceptions of the intercalary growth in the chalazal regions of cycads has
led to the interpretation of their seeds as bitegmic (Stopes 1905). It has been
taken up to reinterpret the lyginopterid pteridosperm seed as the bitegmic
forebear of ...
7
Paleobotany: The Biology and Evolution of Fossil Plants
Tristichia ovensi gen. sp. nov., a protostelic Lower Carboniferous pteridosperm
from Berwickshire and East Lothian, with an account of some associated seeds
and cupules. Transactions of the Royal Society of Edinburgh 64: 477–492.
Edith L. Taylor, Thomas N. Taylor, Michael Krings, 2009
8
Sphenopteris Sellardsii, a Problematical
Pteridosperm from ...
Discusses the characteristics of Sphenopteris sellardsii, a new species of pteridosperm based on fertile foliage from the Elmo Limestone member of Early Permian age in east-central Kansas.
9
Geological Survey Professional Paper
DISCUSSION The specimen described here is not only the first demonstrably
ovuliferous pteridosperm found in the Hermit Shale, but it is also one of very few
examples of seed-bearing pteridospermous foliage known in the Paleozoic of
North ...
10
Introduction to Taxonomy of Angiosperms
8.3.3. Pteridosperm. Theory. According to Andrews (1961), some Pteridosperms
may have given rise to angiosperms. Many Palaeozoic pteridosperms, like
Lagenostoma possess cupulate seeds. On the other hand in Gnetopsis (Figure
8.4) ...
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «PTERIDOSPERM»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
pteridosperm w wiadomościach.
City-sized fossilized forest found
Detail of a pteridosperm, an extinct seed-producing fern-like plant. The image shows an area about six cm (2.4 inches) in height. (Courtesy Howard Falcon-Lang) ... «World Science, Kwi 07»
World's first rainforest found in Illinois
Detail of a pteridosperm, an extinct seed-producing fern-like plant. Width across image about six centimeters. Credit: Dr. Howard Falcon-Lang ... «Mongabay.com, Kwi 07»
