Both Cassytha and Leptospermum have green tissue and pigments that we could extract and run on our high pressure liquid chromatography (HPLC) system. Robert was investigating how stressed the host plant gets when infected with the Cassytha, plus if the plants were more stressed in high or low light.
The paper is published online in Functional Plant Biology Cirocco, RM, Waterman, MW, Robinson, SA, Facelli, J, Watling JR. Native hemiparasite and light effects on photoprotection and photodamage in a native host. Leptospermum myrsinoides. Functional Plant Biology
In this picture you can see Cassytha (the green stem) attaching its modified root (haustoria) into an acacia plant. The cover image above shows how the parasite can blanket its host- most of what you see is the Cassytha.