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CALLANDRIUM CALLISTOPHYTOIDES, GEN. ET SP. NOV., THE PROBABLE POLLEN‐BEARING ORGAN OF THE SEED FERN, CALLISTOPHYTON
Author(s) -
Stidd Benton M.,
Hall John W.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09829.x
Subject(s) - biology , sporangium , frond , pollen , pennsylvanian , phyletic gradualism , genus , fern , botany , phylogenetics , paleontology , spore , biochemistry , structural basin , gene
A new genus of pteridosperm pollen organ is described from Pennsylvanian age coal balls of Illinois. Individual sporangia are grouped into radial synangia which are borne in opposite pairs on the abaxial surface of slightly modified pinnules. Sporangia contain monosaccate pollen with a distinct sulcus, referable to the pollen genus Vesicaspora . Pinnules are borne on a regularly pinnate frond which is circinately coiled when young. At least a large portion of the frond is fertile and possesses anatomical features similar to those of Callistophyton . Phyletic relationships with other pteridosperm pollen organs are discussed.