what do fungal threads of lichen produce
3produced. Soredia contain algae and fungal cells that escape from the parent lichen and grow into a new lichen thallus. Other lichens produce outgrowths that break off and grow into the same lichen they came from. These are called isidia (tiny, cylindrical projections, Fig. 4) or lobules (little flaps of tissue, Fig.oredia contain algae and fungal cells that escape from the parent lichen and grow into a new lichen thallus. Other lichens produce outgrowths that break off and grow into the same lichen they came from. These are called isidia (tiny, cylindrical projections, Fig. 4) or lobules (little flaps of tissue, Fig.