Image Interpretation

 

What are the features labeled A-D? Try and identify the plant stems. Are these plants in growth position or have they been transported? How can you tell? The scale bar = 3mm.

A: Inner cortex.
B: Vascular tissue - phloem and xylem strand.
C: Hemispherical projection with rhizoids.
D: Partially decayed cortex.
Plant: Rhynia gwynne-vaughanii
Growth position or transported: These stems are most likely in growth position because they all show the same alignment with very little cellular decay, and they are not fragmentary. Also there are no fragments of other plant species and very little detrital material present.