Leaf photosynthetic rate of tropical ferns is evolutionarily linked to water transport capacity.

PLoS One · 2014 · PMC3886989 · PMID 24416265

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marginally nonsignificantno p-value reported

However, Walls (2011) found that the relationship between D vein and A max in angiosperms is marginally nonsignificant with phylogenetic regression at a global scale [19] .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.