Crossword clue: the macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.

The most common answer is ooephoridium (12 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

ooephoridium 12 letters web-def

The macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.

oophoridium 11 letters web-def

The macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.