Indusium (plural=indusia): a protective membrane on developing spores
Sorus (plural=Sori): cluster of sporangia
Sporangium (plural sporangia): organ which produces spores
Indusium (plural=indusia): a protective membrane on developing spores
Sorus (plural=Sori): cluster of sporangia
Sporangium (plural sporangia): organ which produces spores