Multiple choice Isidia are organs of vegetative propation found in fungi organs of vegetative propagation found in lichens organs which contain a photobiont in the interior and a mycobiont on the outside both (2) and (3) Reveal answer Fill a bubble to check yourself D Correct answer Explanation Isidia are vegetative propagules found in lichens. They are small, outgrowths of the thallus containing both the photobiont and mycobiont, which break off to form new lichens.