What's the difference between pteridologist and pteridophyta?
Pteridologist
Definition:
(n.) One who is versed in pteridology.
Example Sentences:
(1) One of the new species, Cyathea moranii , was named in honour of Robbin C Moran of the New York Botanical Garden, a leading pteridologist and prolific collector and writer.
Pteridophyta
Definition:
(n. pl.) A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia.
Example Sentences:
(1) To elucidate the evolutionary relationship between the Spermatophyta, Pteridophyta and Bryophyta, we cloned a fragment of chloroplast DNA from the fern Angiopteris lygodiifolia (Pteridophyta) and determined its nucleotide sequence.
(2) These two polyamines were not detected in any species of Pteridophyta, Gymnospermae, and fungi even though their possible precursor, diaminopropane, was found in some species.
(3) In the course of evolution toward polymerization and integration of fronds, the group of arborescent Pteridophyta were transformed into shoot plants, initially of the Cycas type.
(4) The following separation of the main growth forms of Pteridophyta is proposed: thin-rhizomatous, creeping-rosetted, ascending-rosetted, vertical-rosetted, and arborescent.
(5) Polyamine contents of various species of plants and fungi including Bryophyta, Pteridophyta, Gymnospermae, Ascomycota, Basidiomycota, and Lichenobionta were determined by the combination of six chromatographic techniques.
(6) Homospermidine was one of the major polyamines in Bryophyta and Lichenobionta, and was detected in most species of Pteridophyta and sporadically in higher plants.
(7) Comparisons of the deduced amino acid and nucleotide sequences of these genes from the three plant groups indicate that Angiopteris sequences are more closely related to those of Bryophyta species (85% identity on average) than to those of seed plants (76% identity on average), supporting a hypothesis that the Bryophyta and Pteridophyta diverged more recently from one another than their common progenitor diverged from that of the Spermatophyta.
(8) A survey and discussion are presented of plants classified as Spermatophyta and Pteridophyta, extracts of which have been shown to be oncogenic or tumor-promoting in animals.
(9) Plants known to contain any of the 28 oncogens (excluding shikimic acid and caffeine) have been tabulated; they represent at least 454 species, 110 genera, and 34 families of Spermatophyta and Pteridophyta.
(10) The most primitive growth form of Pteridophyta is acknowledged as the thin-rhizomatous.