Phloem histology of Lower Pennsylvanian Psaronius
DOI:
https://doi.org/10.54991/jop.1981.1403Keywords:
Histology, Phloem, Psaronius, Marattiales, Lower PennsylvaniaAbstract
Phloem anatomy of a Psaronius species is described based on Lower Pennsylvanian coal ball specimens. The phloem tissue completely surrounds the C-shaped xylem strands and is separated from them by a 3-cell wide parenchymatous sheath. The phloem zone consists of a central band of large diameter sieve elements that are bordered by zones of phloem parenchyma on each side. The abaxial phloem tissue is more extensive than the adaxial phloem and contains very small diameter cells which may represent protophloem. The phloem anatomy of Psaronius is compared with that of extant marattialeans.
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Brebner G 1902. On the anatomy of Danaea and other Marattiaceae. Ann. Bot., 16: 517-552.
Eggert DA & Gaunt DA 1973. Phloem of Sphenophyllum. Amer. J. Bot., 60: 755-770.
Eggert DA & Kanemoto NY 1977. Stem phloem of a Meddle Pennsylvanian Lepidodendron. Bot. Gaz., 138: 102-111.
Esau K 1969. The Phloem. Encyclopedia of Plant Anatomy, Vol. 5, Part 2. Gebruder-Borntraeger, Berlin.
Galtier J & Hebant C 1973. Sur le phloem et le cambium d’une Calamopityacee, Pteridospermale probable du Carbonifere inferior francais. C.R. Acad. Sci. Paris, Ser. D, 276: 2257-2259.
Shove RF 1900. On the structure of the stem of Angiopteris evecta. Ann. Bot., 14: 497-525.
Smoot EL 1979. The phloem of Etapteris leclercqii and Botryopteris tridentata. Am. J. Bot., 66: 511-521.
Smoot EL & Taylor TN 1978. Sieve areas in fossil phloem. Science, 202: 1081-1083.
Wilson ML & Eggert DA 1974. Root phloem of fossil tree-sized Arthrophytes. Bot. Gaz., 135: 319-328.
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