Editing Microphylls and megaphylls (section)

{{About|the classification based on leaf vasculature|the terms "Microphyll" and "Megaphyll" as classifications of leaf size|Leaf size}} 
In [[plant anatomy]] and [[evolution]] a '''microphyll''' (or '''lycophyll''') is a type of [[plant]] [[leaf]] with one single, unbranched leaf vein.<ref name=Kaplan2001>{{cite journal
 | author = Kaplan, D.R.
 | year = 2001
 | title = The Science of Plant Morphology: Definition, History, and Role in Modern Biology
 | journal = American Journal of Botany
 | volume = 88
 | issue = 10
 | pages = 1711–1741
| doi = 10.2307/3558347
| jstor=3558347 
 | pmid = 21669604
| doi-access = free
 | bibcode = 2001AmJB...88.1711K
 }}</ref>  Plants with microphyll leaves occur early in the [[fossil]] record, and few such plants exist today. In the classical concept of a microphyll, the leaf vein emerges from the [[Stele (biology) | protostele]] without leaving a [[leaf gap]]. Leaf gaps are small areas above the node of some leaves where there is no vascular tissue, as it has all been diverted to the leaf. '''Megaphylls''', in contrast, have multiple veins within the leaf and leaf gaps above them in the stem.