Sporangia
Spore-producing sacs called sporangia grow at the ends of long, thin stalks in this photo of the moss Esporangios bryum.
Source
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"OpenStax College, Early Plant Life. October 17, 2013."
http://cnx.org/content/m44635/latest/Figure_25_01_02.jpg
OpenStax CNX
CC BY 3.0.
