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Webster 1913 Edition
Macrosporangium
‖
Macˊro-spo-ran′gi-um
,Noun.
[NL. See
Macro-
, and Sporangium
.] (Bot.)
A sporangium or conceptacle containing only large spores; – opposed to
microsporangium
. Both are found in the genera Selaginella
, Isoctes
, and Marsilia
, plants remotely allied to ferns.