sporangium
Botanical term for a structure that produces and contains spores in plants, fungi, or algae.
Sporangia are lined up on the underside of fern leaves.
macrosporangium; megasporangium
sorus
Compound of 胞子 (spore) and 嚢 (sac, capsule). The exact historical derivation is uncertain, but the kanji directly reflect the meaning.