kbmcc's Identifications

For the Coleosporium elephantopodis rust fungus, cf. inaturalist.org/observations/172784201

Similar genus comparison gratefully copied from @mjpapay:

Elephantopus carolinianus
• a few leaves on the ground, but not a ring of leaves
• leaves of inflorescence gradually reduced in size from the lower section where they are virtually identical to the basal-most leaves of the plant, markedly diminished only at the upmost section of the inflorescence

Elephantopus tomentosus
• a ring of leaves on the ground
• inflorescence essentially without leaves, or the inflorescence leaves are much smaller, and little resemble the surface texture, morphology, and size of the basal ring of leaves