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prosporangium
prosporangium n.
Brit. 
/ˌprəʊspəˈran(d)ʒɪəm/
, /ˌprəʊspəˈran(d)ʒɪəm/U.S. /ˌproʊspəˈrændʒiəm/
(plural prosporangia) [after German Prosporangium (1884 in the passage translated in quot 1887)] Mycology a sporangium-like body that gives rise to the vesicle in which the zoospores develop./ˌproʊspəˈrændʒiəm/ΚΠ
1887 H. E. F. Garnsey & I. B. Balfour tr. H. A. de Bary Compar. Morphol. & Biol. Fungi 163 When it [sc. Polyphagus Euglenæ] has reached a certain size,..it shows itself in many specimens to be a sporangium, or, if the term is preferred, a prosporangium [Ger. Prosporangium].
1930 Science 21 Mar. 324/1 The prosporangium serves as reservoir of the protoplasm intended for the development of the zoospores.
1987 Mycologia 79 587 A prosporangium develops inside the germ tube and the incipient sporangium develops from the outflow of protoplasm through the zoospore cyst.
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