The introduction of electrical illumination into different caves makes the intrusion of some mosses and ferns into such depths of the caves possible which at previous occasions (i. e. before the installation of electrical light) were found sterile of these plants. Investigations of two caves in Czechoslovakia and 4 caves in Hungary revealed the presence of mosses thriving deep inside of these caves making use of the artificial illumination.
Über die Moose, die unter dem Einfluβ der elektrischen Beleuchtung in das Innere der Höhlen in Ungarn und in der Tschechoslowakei eindringen.
International Journal of Speleology,
Available at: https://digitalcommons.usf.edu/ijs/vol1/iss1/7