monosporangium
/ˌmɒnə(ʊ)spəˈran(d)ʒɪəm/Botany
noun
A sporangium containing or producing monospores, characteristic of some red algae. Usually in plural.
Origin
Late 19th century. From mono- + sporangium. Compare slightly earlier monosporogony, and also polysporangium, tetrasporangium.