sunflower stem, helianthus annuus, longitudinal section, 20x micrograph

sunflower stem sunflower longitudinal micrograph microscope light longitudinal l s ls stained stain helianthus annuus helianthus 20x photomicrograph light magnified magnification cell cells plant layer sectioned plant hematoxylin eosin histology anatomy cytology microanatomy specimen sample microscopy visual microsection slide micro structure botany botanical biology microbiology science research lab education