docdutronc Posted November 15, 2009 Share Posted November 15, 2009 this terminal pinna is being differentiation, it comes from St. Clair, his base will gradually divide to form a complete penne ,this sample comes from northern France .... Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 15, 2009 Share Posted November 15, 2009 Bruno...... Really nice to see the tip leaf, and where it begins to start dividing forming the side leafs... the edge of the leaf itself never stops at the stalk on this species.... you said a technical term that describes this previously but i have forgotton... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Plantguy Posted November 16, 2009 Share Posted November 16, 2009 Bruno, nice specimens as always. Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted November 16, 2009 Author Share Posted November 16, 2009 Bruno...... Really nice to see the tip leaf, and where it begins to start dividing forming the side leafs... the edge of the leaf itself never stops at the stalk on this species.... you said a technical term that describes this previously but i have forgotton... Hi Steve this technical term is decurrent, indeed, it is valid for two species, Alethopteris and Lonchopteris, the difference is in the veins ,bifurcated for the first anastamosed for the second .... bruno Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 16, 2009 Share Posted November 16, 2009 Bruno.... your a wealth of carb plant knowledge ..... its to be admired..... Im sure your book will be the first one I read from cover to cover since I left school....Thanks for helping me out.... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Shamalama Posted November 16, 2009 Share Posted November 16, 2009 So if pinnule are showing on a specimen, does that mean it's still Alethopteris missouriensis or another species? I get confused by the various leaves and how some will be just leaves from tip to base and others will show evidence of pinnule growth fairly close to the tip as in your examples. -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
RJB Posted November 16, 2009 Share Posted November 16, 2009 That one on the left is absolutly beautiful! I love the rock that its in too. thanks for showing. RB Link to comment Share on other sites More sharing options...
fig rocks Posted November 16, 2009 Share Posted November 16, 2009 Very nice doc! Link to comment Share on other sites More sharing options...
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