M3E1G2A1S1P3O1R1A1N1G2I1A1
19 points
MEGASPORANGIA is validvalid
MEGASPORANGIUM,
MEGASPORANGIUM, the sporangium in heterosporous plants where the megaspores develop
MEGASPORANGIUM,
MEGASPORANGIUM, the sporangium in heterosporous plants where the megaspores develop