Medicinal Genomics, 19 Sep 2017 "Not vascularized" -no reference cited. Here is one that suggests otherwise. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3522…
HEMP.xxx, 16 May 2017 Rapid quantification of plant-powdery mildew interactions by qPCR and conidiospore counts | Plant Methods https://t.co/vvXLaEc6hX…