Journal
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
Volume 126, Issue 3-4, Pages 211-223Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0034-6667(03)00087-3
Keywords
trilete; spores; ultrastructure; Ordovician; Silurian; rhyniophytoids
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Seven trilete spores from lower Wenlock to lower Ludlow sediments, all assignable to the form genus Ambitisporites, display a range of ultrastructural features. Various combinations of distal vs. proximal wall thickness, prominence of crassitude and structure/presence of trilete mark and suture distinguish the various types. Comparisons with coeval in situ spores support affinities for some of the specimens, but not others. A review of modern plant spores suggests possible production by lycophytes and hornworts, but these associations are speculative. The controversial Ordovician spore Virgatasporites possesses a robust wall and equatorial crassitude, but its relationship to the embryophyte lineage remains equivocal. (C) 2003 Elsevier B.V. All rights reserved.
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