Liborius believes that it exists only in the intercellular spaces of the "root bark."
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
The mycelium penetrates the intercellular passages, and may sometimes be found in parts of the plants where the fungus does not develop itself.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke
De Bary then proceeds to describe experiments which he had performed by watering growing plants with these zoospores, the result being that the germinating tubes did not penetrate the epidermis, but entered by the stomates, and there put forth an abundant mycelium which traversed the intercellular passages.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke